Swimwear Size Guide
Swimwear Size Guide
Designer swimwear sizing is notoriously inconsistent. A Medium in one brand can fit like a Small in another. Use this guide to find your perfect fit before you buy. When in doubt, go by measurements, not size labels.
US Size vs. International Size Conversion
| US Size | EU Size | UK Size | AU Size | FR Size | IT Size |
|---|---|---|---|---|---|
| XS (0–2) | 32–34 | 6–8 | 6–8 | 36–38 | 36–38 |
| S (4–6) | 36–38 | 8–10 | 8–10 | 38–40 | 40–42 |
| M (8–10) | 38–40 | 12–14 | 12–14 | 42–44 | 44–46 |
| L (12–14) | 42–44 | 16–18 | 16–18 | 46–48 | 48–50 |
| XL (16–18) | 46–48 | 20–22 | 20–22 | 50–52 | 52–54 |
Bust / Waist / Hip Measurement Chart
| Size | Bust (in) | Waist (in) | Hips (in) |
|---|---|---|---|
| XS | 31–32" | 23–24" | 33–34" |
| S | 33–34" | 25–26" | 35–36" |
| M | 35–36" | 27–28" | 37–38" |
| L | 37–39" | 29–31" | 39–41" |
| XL | 40–42" | 32–34" | 42–44" |
How to Measure Yourself
- Bust: Measure around the fullest part of your chest, keeping the tape parallel to the ground.
- Waist: Measure around your natural waist, the narrowest point of your torso, usually about 1 inch above your belly button.
- Hips: Measure around the fullest part of your hips and seat, about 7–9 inches below your natural waist.
Brand-Specific Sizing Notes
Acacia Swimwear
Runs small. Size up. Acacia uses minimal stretch fabric in many styles, and their cuts are narrow. If you are between sizes, go up. Tops with underwire or structured cups are especially fitted.
Boys + Arrows
Runs true to size with a relaxed, slightly slouchy fit. If you prefer a more supportive fit, size down; if you prefer ease and movement, stay true to size.
Frankies Bikinis
True to size. Consistent, flattering fits across the range. Triangle tops are adjustable and forgiving across a half-size range. Bottoms have moderate coverage and stretch well.
Beach Bunny
True to size with a body-conscious, curve-hugging fit. If you are between sizes or have a fuller bust, sizing up in the top is recommended.
Vitamin A
Runs small to medium. Consider sizing up. Moderate stretch and minimalist, body-close cuts. Customers with curves or a fuller bust often prefer going up one size, especially in underwire and molded cup styles.
ViX (Paula Hermanny)
Runs small. Brazilian sizing. ViX follows Brazilian sizing conventions, which run approximately one size smaller than US standards. When in doubt, size up.
L*Space
True to size with a slightly sporty, active fit and good coverage and support.
MIKOH
Runs small to true depending on the style. String-tie styles are very adjustable, so sizing is more forgiving. If you prefer more coverage, size up.
Bond-Eye Australia
True to size with a stretchy, supportive fit. Their one-pieces in particular fit a wide range of body types within each size label.
Finding the Right Fit: Bikini Tops
For bikini tops, your cup shape and band width matter as much as your size label. Triangle tops with adjustable ties are the most forgiving. If you have a fuller bust (D cup or above), look for styles with underwire, thicker straps, or molded cups, and size up if the item description mentions "minimal coverage." Always check the product description for any included fit notes.
Finding the Right Fit: Bikini Bottoms
Bikini bottoms should be sized by your hip measurement, not your waist. If you are between sizes, size up for more coverage and comfort. Cheeky cuts run smaller than full-coverage styles for the same size label.
Finding the Right Fit: One-Pieces
One-pieces should be sized by your largest measurement (bust, waist, or hips, whichever is biggest on the chart above). Many one-pieces have adjustable straps to fine-tune the fit. If you have a long torso, look for styles described as "long torso" or "adjustable," and consider sizing up to avoid pulling.
Still unsure? Send your measurements and the style you are eyeing through our contact form and we will give you a fit recommendation.