How to Choose the Right Underwear Size: A Complete Sizing Guide

Why Underwear Sizing Matters More Than You Think

Wearing the wrong underwear size doesn't just feel bad — it can actually affect your health and confidence. Too tight, and you're dealing with restricted circulation, skin irritation, and visible pressure marks. Too loose, and you're fighting bunching, riding up, and a complete lack of support.

Yet most people have never actually measured themselves for underwear. They buy the same size they've always bought, even as their body changes.

How to Measure Yourself

You only need two measurements and a flexible tape measure.

Waist Measurement

1. Stand naturally — don't suck in your stomach
2. Wrap the tape around your natural waist (the narrowest part of your torso, usually about 1 inch above your navel)
3. Keep the tape snug but not tight — you should be able to slide one finger underneath
4. Read the measurement in inches

Hip Measurement

1. Stand with your feet together
2. Wrap the tape around the fullest part of your hips and buttocks
3. Keep the tape level all the way around
4. Read the measurement in inches

Important: Your hip measurement typically determines your underwear size, not your waist measurement.

Women's Underwear Size Chart

| Size | Hip (inches) | Waist (inches) | |------|:---:|:---:| | XS | 33-34 | 23-24 | | S | 35-36 | 25-26 | | M | 37-38 | 27-28 | | L | 39-40 | 29-30 | | XL | 41-42 | 31-32 | | XXL | 43-44 | 33-34 | | XXXL | 45-46 | 35-36 |

Men's Underwear Size Chart

| Size | Waist (inches) | Hip (inches) | |------|:---:|:---:| | S | 28-30 | 35-37 | | M | 31-33 | 38-40 | | L | 34-36 | 41-43 | | XL | 37-39 | 44-46 | | XXL | 40-42 | 47-49 | | XXXL | 43-45 | 50-52 |

What to Do When You're Between Sizes

This is where most people make a mistake. If you're between sizes, always size up — especially for these styles:

• Shaping/control underwear: Already compressive. Sizing down doubles the squeeze.
• High-waist styles: A too-small waistband rolls down constantly.
• Safety shorts: Too tight at the thigh = visible cutting line.

The only exception is very stretchy ice silk or microfiber — these fabrics have enough give that going with the smaller size often works.

Size Varies by Style

This catches people off guard: you might be a Medium in bikini briefs but need a Large in high-waisted shapers. Here's why:

Bikini / Hipster

The most forgiving style. Minimal fabric with stretchy construction means your standard size usually works.

High-Waist Brief

More fabric covering more area means more places where fit matters. The waistband needs to sit comfortably at your waist without rolling, and the leg openings need enough room at your hips.

Thong

Fit is critical here. Too loose and it won't stay in place. Too tight and it digs in. Stick to your exact measured size.

Safety Shorts

The thigh circumference becomes the critical measurement. If you have muscular or fuller thighs, size up to avoid the shorts cutting into your legs.

Shaping Underwear

These are designed to compress. Buy your true size — the shaping is built into the garment engineering, not from wearing a smaller size. Sizing down just makes it uncomfortable without improving the shaping effect.

Signs You're Wearing the Wrong Size

Too Small

• Red marks on your skin after removing
• Waistband rolls or folds over
• Fabric cuts into your thighs or hips
• Constant wedgies or riding up
• Visible muffin top above the waistband

Too Large

• Fabric bunches or wrinkles under clothing
• Underwear shifts around during movement
• Waistband slides down throughout the day
• Excess fabric visible through tight pants

Pro Tips for Perfect Fit

1. Re-measure every year — Body size fluctuates. Don't assume last year's size still fits.

2. Wash before judging — New underwear has factory sizing. After 1-2 washes, the fabric relaxes to its true fit.

3. Test with your tightest outfit — Put on the underwear, then your tightest pants or dress. Check for VPL in a mirror. If you see lines, try a size up or a different style.

4. Different brands = different sizing — A Medium at one brand might be a Large at another. Always check the specific size chart.

5. Consider your body shape, not just numbers — If you have a significant difference between waist and hip measurements (pear shape), prioritize the hip measurement for sizing.

The Bottom Line

Finding the right underwear size takes 2 minutes of measuring and a quick check of the size chart. That small investment saves you from years of discomfort, constant adjusting, and wasted money on underwear that doesn't fit. Measure, check the chart, and when in doubt, size up.