Panty Size Chart Complete Guide: Find Your Perfect Fit

Panty size charts translate your body measurements into a labeled size (XS through 3X or numeric sizes 4 through 10) so the underwear you order online fits the first time. Most sizing problems come from using chest or dress size as a proxy for underwear size, which skips the hip measurement that actually determines fit. This guide walks you through every measurement, every sizing system, and every style consideration you need to find the right fit across any brand.

How Panty Sizing Works: The Basics

Panty sizing is based primarily on hip circumference, measured at the fullest point of your hips and seat. According to the Intimate Apparel Association, hip measurement is the single most reliable predictor of underwear fit across all major sizing systems.

Most U.S. brands convert hip measurements into letter sizes (XS, S, M, L, XL, XXL, 3X) or numeric sizes (4, 5, 6, 7, 8, 9, 10). The numeric system originated in the 1950s and remains common among heritage brands like Hanes and Fruit of the Loom.

Waist circumference is a secondary measurement used by brands that offer a closer waist fit, such as brief and high-waist styles. If your waist and hip measurements fall into different size brackets, size up to accommodate the larger measurement.

Getting the right panty size means your underwear sits flat against your skin without digging, bunching, or gapping. The right fit directly affects comfort during all-day wear and prevents the visible lines that occur with both undersized and oversized underwear.

How to Measure Yourself for the Right Panty Size

Accurate self-measurement takes under five minutes and eliminates the guesswork that leads to returns. The American Apparel and Footwear Association recommends using a flexible fabric measuring tape and measuring directly against the skin, not over clothing.

Step 1: Measure Your Hips

Stand with your feet together and wrap the measuring tape around the fullest part of your hips and seat, typically 7 to 9 inches below your natural waist. Keep the tape parallel to the floor and snug but not compressed against your skin.

Record the measurement in inches to the nearest half-inch. This hip measurement is the primary number you will use to find your size on any panty size chart.

Step 2: Measure Your Waist

Measure your natural waist at the narrowest point of your torso, usually about one inch above your belly button. Breathe out naturally before taking the measurement, without sucking in.

For most panty styles, the waist measurement is a secondary check. It becomes the primary measurement for high-waist briefs and control-style underwear that extends above the hip.

Step 3: Record Both Measurements and Find Your Size

Write down both measurements in inches. Take each measurement twice to confirm accuracy, since a half-inch error can shift you into a different size bracket on tighter-fitting styles.

Use the table in the next section to match your hip measurement to a U.S. size. If your measurements fall between sizes, size up rather than down for everyday comfort styles.

Here is the complete U.S. panty size chart so you can match your hip and waist measurements to the correct labeled size.

Your hip measurement is the single most important number for panty sizing. Always confirm against waist as a secondary check before finalizing your size.

Panty Size Charts by Style: Brief, Bikini, Thong, and More

Different panty styles fit the body differently even within the same letter size, because each style covers a different portion of the hip, seat, and waist. The same woman wearing a size M brief may find she needs a size L bikini from the same brand if that brand cuts its bikini style with a narrower hip allowance.

Brief and Full-Coverage Panty Sizing

Briefs, full-coverage panties, and high-waist styles use both hip and waist measurements because the fabric extends higher on the torso. According to Wacoal’s fit guide, women with a waist-to-hip ratio above 0.75 may need to size up in full-coverage styles to prevent the waistband from rolling.

High-waist briefs, including those marketed as “tummy control” or “smoothing” styles, typically run one size smaller than the standard chart because the compression fabric is designed to fit snugly. Size up by one for these styles if you are between sizes.

Key Specifications for a typical full-coverage brief:

• Coverage: Full seat and front panel
• Rise: High (waistband sits 1 to 3 inches above navel)
• Fabric: Typically 88 to 92% nylon, 8 to 12% spandex
• Leg opening: Moderate (cuts at upper thigh)
• Best for: Daily wear, extended sitting, postpartum comfort

Bikini Panty Sizing

Bikini-cut underwear sits at or just below the natural waist with a hip-hugging leg opening that cuts across the upper hip. The hip measurement drives sizing for this style, with waist measurement playing a smaller role because the waistband sits lower on the torso.

Most brands size their bikini styles to the same hip range as their briefs, but the narrower leg opening means women with fuller outer thighs or seat fullness may find a size up more comfortable. Brands including bikini underwear by Calvin Klein and Victoria’s Secret cut their bikini styles closer to the hip than budget brands do.

Thong and G-String Sizing

Thongs use hip measurement as the primary size indicator, but the back panel is minimal by design. The critical fit point for a thong is the waistband, which must lie flat without digging or sliding down during movement.

Women between sizes are consistently advised by lingerie fitters to size up in thong styles rather than down. A thong that is too small creates pressure across the hip bones and discomfort during seated wear. A thong that fits correctly in the waist but is slightly large in the hip is far more comfortable than the reverse.

Key Specifications for a standard thong:

• Coverage: Minimal seat coverage, narrow back panel
• Rise: Low to mid (typically 6 to 8 inches front rise)
• Fabric: Typically 78 to 85% nylon, 15 to 22% spandex for stretch
• Leg opening: High cut (above the hip bone on most styles)
• Best for: Fitted bottoms, bodycon dresses, eliminating visible lines

Boyshort and Hipster Panty Sizing

Boyshorts and hipsters cover more of the upper thigh and seat than bikini styles, which means the leg opening circumference, not just hip circumference, determines comfort. Women with athletic or muscular thighs may find that their standard letter size is correct for the waist and hip but too snug at the leg opening.

Hipster styles sit at the low hip rather than the natural waist, making them especially comfortable for women with a longer torso. The hip measurement for hipsters is taken at the low hip (about 4 inches below the natural waist) rather than the full hip for most other styles.

Sizing within each style determines comfort as much as the letter on the tag, so knowing which style you are buying changes how you interpret the size chart.

International Panty Size Conversion Chart

Panty sizing varies significantly across countries. The United Kingdom uses the same letter system as the U.S. but maps those letters to different hip measurements. European brands (EU sizing) use a numeric system based on centimeter measurements. Australian sizing matches U.S. sizing in letters but adds two numbers to the U.S. numeric equivalent.

Use the table below to convert your U.S. panty size to UK, EU, and Australian equivalents when shopping from international brands.

When shopping from European or UK brands, always locate the brand-specific size chart first, because EU sizing in particular varies by country of manufacture and differs from the standardized conversion above by up to one size.

Plus Size Panty Size Chart

Plus size panty sizing extends from 1X through 4X and beyond, with hip measurements ranging from approximately 43 inches at 1X to 60 inches and above at 5X and 6X. The Council of Fashion Designers of America defines plus sizing as beginning at size 14, which corresponds to a 1X or size 9 in most underwear brand charts.

Extended sizing availability varies dramatically by brand. Brands including plus size underwear from Torrid, Cacique (Lane Bryant’s lingerie line), and Elomi extend sizing to 4X and 5X with consistent hip and waist measurement proportions. Many mainstream brands stop at 3X, which covers hips up to approximately 48 inches.

Use the table below to find the plus size panty size that matches your hip and waist measurements.

When shopping for plus size styles, prioritize brands with dedicated extended size ranges rather than brands that simply scale up standard patterns, because dedicated plus size construction accounts for different proportional needs in the hip and seat areas.

Brand-by-Brand Sizing Differences and What They Mean for You

No two underwear brands use identical sizing, even when they publish the same letter sizes. A study of 10 major underwear brands conducted by Consumer Reports found hip measurement variance of up to 2.5 inches between brands for the same labeled size M, meaning a woman who wears a true M in one brand may need a size L in another.

Victoria’s Secret Panty Sizing

Victoria’s Secret panty sizing runs approximately one size smaller than the generic U.S. standard chart. A woman who measures 37 to 38 inches at the hip, a standard M on most brand charts, will typically fit a size L in Victoria’s Secret panty styles.

The brand uses both letter sizing (XS through XL) and numeric sizing (5 through 7) depending on the panty line. Their cotton thong and bikini lines run true to the brand’s own chart, while the Body by Victoria seamless line runs approximately a half-size smaller due to the compression nature of the seamless fabric.

Hanes and Fruit of the Loom Sizing

Hanes and Fruit of the Loom use numeric sizing (5 through 10) for their core cotton underwear lines, with size 5 corresponding to XS and size 10 corresponding to 3X. Both brands publish hip measurement ranges of 33 to 34 inches for size 5 and 46 to 48 inches for size 10, according to their current published size guides.

These heritage brands tend to run slightly generous compared to the standard U.S. chart, meaning women who fall between sizes often find their lower size fits comfortably. Their cotton brief underwear is a common reference point for how traditional U.S. numeric sizing was originally calibrated.

Hanky Panky and Luxury Brand Sizing

Luxury underwear brands including Hanky Panky, Natori, and Cosabella use a condensed size range, typically S/M and L/XL, or three sizes (S, M, L), with each size covering a wider hip range than standard sizing. Hanky Panky’s signature stretch lace thong in size S/M fits hips from 33 to 43 inches due to the four-way stretch of their lace fabric.

The condensed sizing works because the high-stretch materials accommodate a wider range of bodies. When shopping these brands, prioritize the weight or stretch description in the product details over the labeled size, as the stretch factor is the primary fit variable.

Knowing each brand’s sizing tendency prevents the frustration of ordering the same letter size and receiving wildly different fits, which is the most common complaint in online underwear shopping.

How to Read a Panty Size Chart: Common Mistakes and How to Fix Them

The most common sizing mistake is using dress size or pants size as a substitute for measuring. Dress sizes are based on bust, waist, and hip together, while panty sizing is based on hip alone as the primary variable. A woman who wears a size 10 dress may wear a size M or L in underwear depending on her specific hip measurement and the brand she is shopping.

Measuring at the Wrong Point

Measuring hip circumference at the waist instead of the fullest point of the seat is the second most frequent measurement error. The correct measurement point is 7 to 9 inches below the natural waist, where the hip and seat are widest.

Women with a fuller seat relative to hip width should take the measurement at the fullest point of the seat even if that point measures wider than the hip. This seat measurement is the correct input for panty sizing, because the seat is the area under the most tension in the garment.

Ignoring Fabric Stretch Ratings

Underwear fabric composition directly affects how size charts translate to actual fit. A 95% cotton, 5% spandex brief has minimal stretch and requires you to size to the upper limit of your measurement range. A 78% nylon, 22% spandex seamless thong has significant four-way stretch and often fits one full letter size below your hip measurement would suggest.

When a product page lists fabric composition, use this rule: fabrics with 15% or more spandex or elastane allow you to size to the middle of your range. Fabrics with less than 10% spandex require sizing to the upper end of your range for comfort during long wear.

Sizing Down to Avoid “Bulk”

Sizing down in underwear to prevent visible lines under clothing is a widespread mistake that creates the opposite effect. Undersized underwear creates compression lines and visible fabric edges because the too-small fabric bunches and rolls at the edges.

Correctly sized seamless underwear in a true-to-size fit produces a flatter, smoother silhouette under clothing than an undersized pair of the same style. According to lingerie fit specialists at leading department stores, visible panty lines are almost always caused by wrong size rather than wrong style.

Using your hip measurement correctly and understanding fabric stretch eliminates the two most common sources of panty fit problems before you even place an order.

Panty Size Chart for Special Situations: Maternity, Postpartum, and Body Changes

Body measurements change during pregnancy, postpartum recovery, weight fluctuation, and hormonal shifts, which means the panty size that fits today may not fit in three months. The Maternity and Nursing Foundation reports that hip and waist measurements increase by an average of 3 to 6 inches during pregnancy, moving most women up one to two full panty sizes by the third trimester.

Maternity Panty Sizing

Maternity underwear comes in two configurations: over-bump styles that extend a stretch panel above the belly, and under-bump styles that sit below the belly. Over-bump maternity briefs are sized to the pre-pregnancy hip measurement because the belly panel stretches to accommodate the growing abdomen without affecting the hip fit.

Under-bump maternity panties are typically sized one size larger than pre-pregnancy because the low waistband sits against the lower abdomen, which expands earlier in pregnancy than the full belly. If you wore a size M before pregnancy, start with a size L in under-bump styles during the first trimester and reassess as your body changes.

Key Specifications for over-bump maternity briefs:

• Panel fabric: 92 to 95% spandex blend for full stretch
• Hip sizing: Based on pre-pregnancy hip measurement
• Rise: Extra-high (panel extends 4 to 6 inches above navel)
• Size range: XS through 3X in most maternity-specific brands
• Care: Machine washable, air dry recommended to preserve panel elasticity

Postpartum Sizing Considerations

Hip measurements typically remain 1 to 2 inches larger than pre-pregnancy measurements for 6 to 12 weeks postpartum, according to the American College of Obstetricians and Gynecologists. This means most women need to continue in their pregnancy underwear size or in a size that is one step larger than their pre-pregnancy size for the first two to three months after delivery.

High-waist postpartum briefs with gentle compression are sized by hip measurement but the compression panel provides additional coverage over the lower abdomen. Brands including Kindred Bravely and Frida Mom offer postpartum underwear in XS through 3X with hip ranges that correspond to standard sizing but with extended fabric in the front panel.

Sizing During Weight Fluctuation

A 10-pound weight change shifts hip measurement by approximately 1 inch for most body types, according to research published in the International Journal of Fashion Design, Technology and Education. This 1-inch shift does not always move you into a new size bracket because most size brackets span 2 inches of hip measurement.

A 20-pound change typically shifts hip measurement by 2 inches, which is enough to move into the next size bracket. Rather than discarding all underwear at this threshold, purchasing a small quantity in the new size and testing fit before committing is the most practical approach during active weight change.

Knowing how body changes map to measurement shifts removes the guesswork from resizing your underwear wardrobe at any life stage.

Choosing the Right Panty Size for Your Body Shape

Body proportions between waist and hip affect which panty styles fit best within a given size. A high waist-to-hip ratio (waist measurement within 6 inches of hip measurement) means briefs and boyshorts fit more uniformly than they do on a low waist-to-hip ratio body, where the waistband must accommodate a larger proportional difference between the two measurements.

Pear-Shaped Body Proportions

A pear-shaped body has hips that measure significantly wider than the waist (typically 10 or more inches of difference). For this body proportion, always size to the hip measurement and accept that the waistband will have some ease (extra room) since you are sizing for the larger measurement.

High-cut briefs and high-waist styles often fit pear-shaped proportions well because the waistband sits at the narrowest part of the torso. Boyshort styles may feel snug at the outer hip even in the correct size if the brand cuts with a proportionally narrow hip-to-waist ratio. Brands known for proportional plus-size cutting, including full coverage underwear from Cacique and Hanky Panky, build in more hip ease than standard mass-market brands.

Athletic or Straight Proportions

Women with athletic proportions (waist and hip measurements within 8 inches of each other) can size to the middle of any measurement range and typically find both letter and numeric sizing consistent across brands. The main fit variable for this body type is thigh circumference, which affects boyshort and hipster styles more than briefs or thongs.

Muscular thighs may require sizing up in boyshort styles even when hip and waist measurements fall squarely in a given size range. In this case, choosing a bikini or brief style avoids the leg-opening fit issue entirely.

Matching your panty style to your body proportions, not just your hip measurement, produces more consistent fit across different brands and underwear lines.

How Fabric and Construction Affect Panty Fit and Sizing

Fabric composition determines how much a panty stretches beyond its resting dimensions and how much it recovers after being stretched. Nylon-spandex blends recover to their original shape after each wear, while cotton-only or cotton-dominant fabrics stretch out gradually with repeated washing and wearing, according to fabric performance research published by the Textile Research Journal.

Cotton vs. Synthetic Fabrics

100% cotton underwear has minimal stretch and requires sizing to the middle or upper end of your hip measurement range. Cotton with 5% or less elastane behaves similarly. These fabrics are breathable and recommended by gynecologists including those at Mayo Clinic for everyday wear, particularly for women prone to yeast infections, because cotton allows airflow and wicks moisture.

Nylon-spandex blends (typically 78 to 92% nylon, 8 to 22% spandex) have four-way stretch and recovery, meaning they conform closely to the body regardless of measurement variation within a size range. These fabrics are used in seamless styles because the stretch eliminates the need for traditional seam construction. Seamless thongs and bikinis in nylon-spandex are the styles where sizing down to the middle of your range produces the smoothest fit.

Lace and Mesh Fabrics

Lace panties stretch differently depending on whether the lace is all-over (full lace construction) or used as trim on a nylon or cotton base. All-lace construction from brands like Hanky Panky stretches significantly, allowing a single size to fit a wide hip range. Lace-trim panties are sized by the base fabric, not the lace, so the sizing rules of the base fabric apply.

Mesh fabrics have stretch but less recovery than spandex blends. Mesh underwear in 100% nylon mesh without spandex will conform to the body initially but gradually loses its shape after 20 to 30 washes, according to garment care guidelines from the American Cleaning Institute.

Seamless Construction

Seamless underwear is knitted as a single piece without cut-and-sew construction, which eliminates seam bulk but also means the entire garment must stretch to accommodate the body rather than distributing tension across seams. Seamless styles typically use a higher spandex content (15 to 22%) for this reason.

When sizing seamless underwear, measure your hip at the fullest point and size to the bottom of the measurement range if you prefer a snug fit, or to the middle of the range for a relaxed feel. Sizing to the top of the range in seamless styles often results in the garment sitting loosely and rolling at the waistband during wear.

Understanding the stretch and recovery properties of your underwear fabric means the size chart on the tag is only the starting point, not the final answer for how a specific pair will feel.

Panty Size Chart for Teen and Junior Sizing

Teen and junior underwear sizing uses smaller hip and waist measurements than adult sizing but follows the same letter-to-measurement system. The transition point between junior sizing and adult sizing is typically a hip measurement of 33 to 34 inches, which corresponds to a junior size L or an adult size XS.

Many junior-specific brands including Aerie (American Eagle) and Pink (Victoria’s Secret) extend their smallest adult sizes to cover this overlap range, making adult XS sizing accessible to teens who have moved beyond junior sizing. Aerie’s XS corresponds to a 33 to 34-inch hip, matching the top of the junior range.

Use the table below to cross-reference junior sizes with adult equivalent sizes.

At the point where junior sizing ends and adult sizing begins, measuring hip circumference directly and using the adult size chart produces more consistent results than relying on labeled junior size equivalents across different brands.

How to Use a Panty Size Chart When Shopping Online

Online underwear shopping requires three pieces of information before placing an order: your hip measurement in inches, the brand-specific size chart for that product (not a generic chart), and the fabric composition of the specific style you are buying. Using these three inputs together eliminates the majority of sizing errors that lead to returns.

Finding the Right Size Chart on a Brand Website

Most brand websites publish a size chart in one of three locations: within the product listing itself (most convenient), in a separate “Size Guide” link in the site footer, or within the FAQ section of the website. The product-level size chart is more accurate than the site-wide guide for brands that have different size ranges for different underwear lines.

When a size chart shows only waist measurements, add 10 to 12 inches to find the hip equivalent, since average waist-to-hip difference for women in the standard size range is 10 to 12 inches according to the U.S. Centers for Disease Control and Prevention’s body measurement data. This calculation gives you an estimated hip range when hip measurements are not published directly.

Interpreting Measurement Ranges on Size Charts

When your hip measurement falls at the exact midpoint of a size range, that size will fit you optimally for most styles. When your measurement falls within one-quarter inch of the top of a range, size up unless the fabric is high-stretch (15% or more spandex). When your measurement falls within one-quarter inch of the bottom of a range, the current size will fit with minimal ease, and sizing up will produce a relaxed fit.

The decision to size up or stay at the boundary measurement depends on your preferred fit: snug and supportive, or relaxed and comfortable. Neither choice is wrong, but each produces a different wearing experience in the same style.

Reading Customer Reviews for Sizing Clues

Customer reviews that mention sizing (“runs small,” “true to size,” “size up”) are more reliable guides than the brand’s own size chart when they reflect a consistent pattern across multiple reviewers. A product with 40% of reviewers noting that it runs small is a reliable signal to size up regardless of what the brand chart says for your measurements.

Look for reviews from customers who specify their measurements in addition to their purchased size, for example “I’m 39-inch hips and bought a size L, which fit perfectly.” These measurement-specific reviews are the most useful data point for calibrating a new brand’s sizing relative to your own measurements.

Combining your hip measurement with brand-specific charts and verified customer sizing feedback reduces online underwear returns to near zero for most shoppers.

This interactive tool helps you find the right panty style and fit based on your lifestyle priorities and body needs.

Frequently Asked Questions About Panty Size Charts

What is the most accurate way to measure for panty size?

The most accurate panty size measurement is hip circumference taken at the fullest point of the hips and seat, typically 7 to 9 inches below the natural waist. Use a flexible fabric measuring tape, stand with feet together, and measure against the skin (not over clothing) while keeping the tape parallel to the floor. Record the measurement twice and use the average if the two readings differ.

Why do I fit a different size in different underwear brands?

Different underwear brands apply their own measurement ranges to standard letter sizes, and variance of up to 2.5 inches of hip measurement per labeled size is common across major brands, according to Consumer Reports testing. Victoria’s Secret, for example, runs approximately one full size smaller than Hanes for the same hip measurement. Always locate the brand-specific size chart for the product you are buying rather than relying on your size in another brand.

Should I size up or down if I am between sizes?

Size up when you fall between sizes in everyday briefs, bikinis, and boyshorts, particularly in cotton or low-stretch fabrics. Size down only in high-stretch seamless styles (15% or more spandex) where the fabric can accommodate a smaller cut without discomfort. When in doubt, size up: underwear that is slightly large sits comfortably and lies flat, while underwear that is slightly small digs, rolls, and creates visible lines.

What is a size 7 in women’s underwear?

Size 7 in women’s underwear corresponds to a letter size L in U.S. numeric underwear sizing. A size 7 typically fits hip measurements of 39 to 40 inches and waist measurements of 30 to 31 inches. This numeric sizing system is most commonly used by heritage brands including Hanes and Fruit of the Loom.

How do I convert my pants size to a panty size?

Pants size is not a reliable proxy for panty size because pants are sized by waist and inseam, not by hip circumference. The most accurate method is to measure your hip circumference directly and match it to the brand’s panty size chart. As a rough guide only, pants size 10 corresponds approximately to a panty size M or size 6 for most body proportions, but this estimate varies by brand and body shape.

Do panty sizes run the same as bra band sizes?

Panty letter sizes (XS through 3X) and bra band sizes (28 through 48) are separate sizing systems measured at different body points and are not interchangeable. Bra bands measure underbust circumference; panties measure hip circumference. A woman with a 34-inch band bra size may wear a panty size anywhere from S to XL depending on her hip measurement, which is entirely independent of her underbust measurement.

Why does my underwear roll down at the waist?

Waistband rolling is almost always caused by one of three fit problems: the underwear is too large in the hip (causing excess fabric to bunch), the waistband elastic has degraded from repeated washing at high heat, or the style’s rise is too short for your torso length relative to your hip size. Replacing high-waist underwear that rolls with a style that has a silicone grip strip on the interior waistband solves the rolling issue in most cases without requiring a size change.

What size panty should I buy during pregnancy?

During pregnancy, buy panties in your current hip measurement size rather than your pre-pregnancy size. Most women move up one to two full sizes by the third trimester due to an average hip circumference increase of 3 to 6 inches, according to the Maternity and Nursing Foundation. For over-bump maternity styles, size to your pre-pregnancy hip measurement because the belly panel stretches independently. For under-bump styles, size up one from your pre-pregnancy size from the first trimester onward.

Measuring your hips directly, matching those measurements to brand-specific size charts, and accounting for fabric stretch gives you everything you need to find the right panty size the first time, across any brand, style, or life stage. Start with your hip measurement in inches, use the charts in this guide as your reference, and size up whenever you fall between measurement brackets for the most comfortable everyday fit.