Buying shapewear online comes with one nagging question: what size shapewear should I buy when you cannot try it on first? Guess too big and it does nothing. Guess too small and it digs in, rolls down, and comes off in the car before you even get home.
The good news is that sizing shapewear is not guesswork once you know which numbers to use. This guide gives you a clear process so you order once and get it right.
Why Your Dress Size Won't Help You Here
The most common sizing mistake starts with a reasonable assumption: if you wear a size 10 dress, you buy a size 10 shapewear piece. Shapewear does not work that way. Dress sizing varies wildly between brands and styles, and it is built around how clothing drapes, not how a garment compresses and supports your body.
Shapewear sizing is built around your actual measurements. That is why two women who both wear the same dress size can need different shapewear sizes. Your shapewear size depends on the circumference of your waist and hips, full stop. Once you start there, the rest of the decision gets a lot easier.
The Two Measurements That Actually Matter
For most shapewear, two numbers decide your size: your waist and your hips. Your waist is the narrowest part of your torso, usually just above the belly button. Your hips are the widest point around your butt and upper thighs. These two measurements map directly to almost every shapewear size chart.
If you only record two numbers accurately, record these. To see how the measurements differ by garment style, our overview of the four main types of body shapers is worth reading alongside this guide.
How to Measure Yourself at Home
Use a sewing measuring tape, the kind used by tailors. Stand relaxed in front of a mirror, breathe normally, and do not suck in or pull the tape tight. The tape should sit flush against your skin without pressing into it.
Measure your waist at the narrowest point, usually just above the belly button.
Measure your hips at the widest point, around your seat and upper thighs.
Keep the tape level all the way around and flush against your skin.
Record both numbers in inches.
Measure a second time to confirm — a single inch can move you between sizes.
Our dedicated walkthrough on taking measurements for buying shapewear shows exactly where to place the tape if you want a visual reference.
Reading the Size Chart: What the Numbers Mean
Every well-made shapewear style comes with a size chart that lists a range of waist and hip measurements for each size. Find the size where both of your measurements fall inside the same range. That is your size. The chart is specific to the garment, so always check the chart on the exact product page rather than assuming your size carries across every style.
If your waist points to one size and your hips point to another, you are between sizes — and the next section covers what to do. The charts on our main shapewear collection are built around real body measurements, so trust the numbers over your instinct about what size you usually wear.
What to Do When You're Between Sizes
Being between sizes is normal, and the choice is not a coin flip. As a rule, size up rather than down. A piece in the larger size will still support and smooth your line while staying comfortable for hours. A piece in the smaller size may feel impressive for the first thirty minutes, then start to dig in, roll down, and leave marks.
⚠ The size-down temptation: Compression should come from the design of the garment, not from forcing your body into a smaller piece. If your waist and hips point to different sizes, always choose the size that fits your larger measurement. Sizing down is the number one cause of shapewear rolling down.
How Compression Level Affects Your Size Choice
Two pieces in the same size can feel completely different depending on their compression level. A medium compression piece in your size will feel smooth and barely there. A firm compression piece in that same size will feel noticeably more structured. That is expected and correct. Firmer compression is not a smaller size — it is a different fabric tension.
This matters because some women feel a firm piece, decide it runs small, and size up unnecessarily — which then leaves the garment too loose to do its job. Trust your measurements first, then choose the compression level that suits the occasion. For everyday wear, find the best styles across our daily use collection.
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