How to size swimsuits correctly
Measure first, label second
Pick a tape measurement and match it to the chart. Labels (S/M/L, US/UK/EU numbers) drift between brands; the underlying body measurement does not. Bust, waist, and hip measurements over the underwear you'll wear. Swimsuits should be tight when dry; they relax in water.
Picking between two sizes
Pick the smaller of two sizes for one-piece and bikini tops; pick the larger for high-cut bottoms. Synthetic spandex blends loosen with chlorine and sun exposure over a season.
Brand and regional variation
The same labeled size can differ by a full size between brands and regions. Asian brands generally run a half size smaller than US brands; European brands fall in between. When in doubt, use the centimetre or inch measurement on the size chart, never the letter.
Common mistakes
- Sizing by your old favourite without checking the new brand's chart.
- Skipping the measurement step. Body shape changes; old numbers go stale.
- Picking too tight in non-stretch fabrics — they don't break in the way leather does.
- Trusting a single review's "runs small / runs large" without looking at the reviewer's measurements.