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Why Bodysuits Are Tricky
A bodysuit is essentially a top that has to fit your entire torso — shoulders to crotch — in one continuous piece. Get the torso length wrong and it pulls down at the shoulders or rides up uncomfortably, no matter how well the chest fits. Measuring flat, with attention to vertical length, is the way to get it right.
What You'll Need
- A flat surface.
- A tape measure.
- The bodysuit laid flat and relaxed, snaps closed.
Bodysuits are usually stretchy, so measure relaxed and note the give.
The Measurements That Matter
- Bust: Across the chest at the fullest point, then doubled.
- Waist: Across the narrowest point, doubled.
- Torso length: From the shoulder (at the neckline) straight down to the crotch snaps — the make-or-break measurement.
- Shoulder: Seam to seam, or strap placement for strappy styles.
Torso Length Is the Critical Number
Just like a one-piece swimsuit, a bodysuit's most common fit failure is vertical — the torso length. Too short and it digs into the shoulders and crotch; too long and it bags at the middle. Because torso length rarely appears on a size chart, measuring it from a bodysuit you own is the most valuable step, echoing the swimwear advice in How to Measure a Swimsuit.
Stretch Changes the Numbers
Bodysuits often use significant stretch with negative ease, so relaxed measurements look small — that's expected. Compare relaxed-to-relaxed against one you own and account for the fabric's give, the ease idea from What Is Ease in Clothing.
How to Use the Measurements
Measure a bodysuit that fits you comfortably and treat its bust, waist, and especially torso length as targets. Match new ones to those numbers rather than the size letter.
Common Mistakes
- Skipping torso length — the top cause of bodysuit discomfort.
- Measuring stretched — keep it relaxed.
- Judging by chest alone — vertical fit matters as much.
Where YourSizer Fits
A bodysuit's full-torso fit is exactly where a flat label falls short. YourSizer factors your proportions and the fabric's stretch into a recommendation, accounting for the vertical fit a chart ignores. See it for brands, shoppers, or pricing.
Sources
- Shopify size chart guide
- Baymard sizing information UX
Frequently Asked Questions
How do you measure a bodysuit for size?
Lay it flat and relaxed, then measure bust and waist (across, then doubled) plus torso length from the shoulder neckline down to the crotch snaps. Torso length is the most important and most overlooked measurement.
Why does my bodysuit pull at the shoulders?
Usually because the torso length is too short for your height, so the garment stretches vertically and pulls down at the shoulders and up at the crotch. Measuring torso length from a bodysuit that fits well prevents this.
Should I measure a bodysuit stretched or relaxed?
Relaxed. Bodysuits often use stretchy fabric that's smaller than your body by design, so a relaxed measurement looks small — that's normal. Compare relaxed-to-relaxed against one you own and factor in the stretch.