Shapewear should feel snug but not tight. It should give you a better-looking shape without cutting off blood flow or restricting your breathing. If it hurts, it is the wrong size — not the wrong body.
To find the right fit, do not assume your shapewear size matches your dress or pant size. Whether you are buying a waist trainer or a full body shaper, accurate body measurements are the only reliable starting point. Here is how to take each one correctly.
Waist Measurement
Stand in front of a full-length mirror and bend gently to the side — the crease that forms is your natural waist. It sits about two inches above your belly button, higher than most people expect. Wrap the tape measure comfortably around your midsection at that point without pulling it tight. You should be able to fit one finger between your skin and the tape.
✓ Key for: Waist trainers, high-waist shorts, waist cinchers, and any garment with targeted midsection compression. This is your most important measurement for shapewear.
Bust Measurement
Start by wearing a lightweight, non-padded bra. You will take two separate measurements:
Wrap the tape measure directly below your breasts, along the ribcage, keeping it parallel to the floor. This is your band size.
Measure the fullest part of your breasts with your shoulders back and chin up. The difference between this number and your band size determines your cup: 1 inch = A, 2 inches = B, 3 inches = C, and so on. Example: underbust 32 + bust 35 = bra size 32C.
✓ Key for: Bodysuits, full body shapers, and any garment with a built-in bra or bust support.
Torso Measurement
This measurement is especially important for full body shapers. If you have a long torso and choose a shaper that is too short, it will pull down throughout the day and cause significant discomfort. You will need a friend to help with this one.
Hold the tape measure at your shoulder, as high as your neck. Run it down the front of your body over the fullest part of your bust, between your legs, and up your back — stopping where you started at the neck. That total length is your torso measurement.
✓ Key for: Full body shapers, long bodysuits, and mid-thigh bodysuits. If you are tall or have a long torso, consider sizing up to avoid pulling or discomfort at the crotch.
Hip Measurement
The fullest part of your hips sits about eight to ten inches below your natural waist — lower than most people measure. Keep the tape measure parallel to the floor and wrap it comfortably around the fullest area of your seat and upper thighs. Do not pull it tight.
✓ Key for: Shorts, panties, and all hip and seat coverage styles. For panty bodyshapers especially, your hip measurement is the deciding number — always size to your hips if your waist and hips fall in different sizes.
Which Measurement Matters Most by Garment Type
| Garment | Primary measurement | Also check |
|---|---|---|
| Waist trainer | Waist | Hips |
| Shorts shapewear | Hips | Waist |
| Panty bodyshaper | Hips | Waist |
| Full body shaper | Torso + waist + hips | Bust |
| Bra / bust shaper | Underbust + bust | — |
How to Know If the Fit Is Right
Once you have your measurements and have chosen your size, here is a simple way to check the fit before committing to wearing it all day:
You can fit one finger under the waistband. You can breathe normally. It feels snug but not painful. You can sit and walk without restriction.
The waistband digs in. You feel restricted when breathing. There is visible bulge above or below the edges. It starts rolling within the first hour.
See the full Jackie London size chart for every garment category.
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