One Piece Swim Size Guide (Inches)
| SIZE | US SIZE | BAND | WAIST | HIGH HIP |
| XS | 0-2 | 26-29 | 20-22 | 25-27 |
| S | 4-6 | 29-31 | 23-25 | 27-29 |
| M | 8-10 | 31-34 | 25-29 | 29-31 |
| L | 12-14 | 34-37 | 29-32 | 31-34 |
| XL | 16/18 | 37-42 | 33-36 | 35-39 |
| XXL | 20-22 | 42-45 | 36-40 | 39-44 |
| XXXL | >24 | >46 | >41 | >45 |
| SIZE | US SIZE | BAND | WAIST | HIGH HIP |
| XS | 0-2 | 26-29 | 20-22 | 25-27 |
| S | 4-6 | 29-31 | 23-25 | 27-29 |
| M | 8-10 | 31-34 | 25-29 | 29-31 |
| L | 12-14 | 34-37 | 29-32 | 31-34 |
| XL | 16/18 | 37-42 | 33-36 | 35-39 |
| XXL | 20-22 | 42-45 | 36-40 | 39-44 |
| XXXL | >24 | >46 | >41 | >45 |