Sizing
Womens
UNE PIECE comes in womens sizes US 2 through 20. Our pieces follow standard sizing and are designed to fit true to size.
Womens Size Guide
| US | Bust (in) | Underbust (in) | Waist (in) | Hip (in) |
| 2 | 29.9 - 31.5 | 25.2 - 26.8 | 23.2 - 24.8 | 33.9 - 35.4 |
| 4 | 31.9 - 33.5 | 27.2 - 28.7 | 25.2 - 26.8 | 35.8 - 37.4 |
| 6 | 33.9 - 35.4 | 29.1 - 30.7 | 27.2 - 28.7 | 37.8 - 39.4 |
| 8 | 35.8 - 37.4 | 31.1 - 32.7 | 29.1 - 30.7 | 39.8 - 41.3 |
| 10 | 37.8 - 39.4 | 33.1 - 34.6 | 31.1 - 32.7 | 41.7 - 43.3 |
| 12 | 39.8 - 41.3 | 35 - 36.6 | 33.1 - 34.6 | 43.7 - 45.3 |
| 14 | 41.7 - 43.3 | 37 - 38.6 | 35 - 36.6 | 45.7 - 47.2 |
| 16 | 43.7 - 45.3 | 39 - 40.6 | 37 - 38.6 | 47.6 - 49.2 |
| 18 | 45.7 - 47.2 | 37 - 38.6 | 39 - 40.6 | 49.6 - 51.2 |
| 20 | 47.6 - 49.2 | 42.9 - 44.5 | 40.9 - 42.5 | 51.6 - 53.1 |
How to measure
Bust: With a soft tape measure, wrap it around the fullest point of your bust.
Underbust: Run the tape around your ribcage, right below the bust where a bra band would rest.
Waist: Measure around the middle of your waist/torso.
Hip: Wrap the tape around the widest part of your hips and bottom — it will typically pass right over the hip crease.
International Size Conversion Guide
| Size | US | AU / UK | EU / FR / ES / PT | DE | IT |
| XS | 2 | 6 | 34 | 36 | 38 |
| S | 4 | 8 | 36 | 38 | 40 |
| S | 6 | 10 | 38 | 40 | 42 |
| M | 8 | 12 | 40 | 42 | 44 |
| M | 10 | 14 | 42 | 44 | 46 |
| L | 12 | 16 | 44 | 46 | 48 |
| L | 14 | 18 | 46 | 48 | 50 |
| XL | 16 | 20 | 48 | 50 | 52 |
| XL | 18 | 22 | 50 | 52 | 54 |
| XXL | 20 | 24 | 52 | 54 | 56 |
Caught between two sizes?
Our swimsuits are built with a firm fit that flatters your figure. When you fall between sizes, go with the larger of the two. For instance, if you're a size 10 on top but a 12 on the bottom (or the other way around), choose the size 12.
Tall or have a longer torso?
If you're tall and/or have a longer torso and occasionally land between sizes, we suggest sizing up to the larger of the two.
Mens
UNE PIECE comes in mens sizes XS through XXL.
Our swimwear is built with a tailored fit. If you'd rather have a relaxed fit, or you sit between sizes, go with the larger of the two.
Kids
UNE PIECE comes in girls sizes AU 5 to 14 and boys sizes AU 00 to 14.