Uniqlo to Athleta clothing size
The short answer
Uniqlo XS is Athleta XXS by the two brands' own charts. 7 of 7 Uniqlo sizes land on a different label at Athleta.
Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.
On 4 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.
| Uniqlo Japan sizing | Uniqlo builds it for | Athleta, by chart | Same label | Athleta builds it for | Athleta also prints |
|---|---|---|---|---|---|
| XS | bust 28.7 to 31.1 in, waist 22.4 to 24.8 in, hip 31.5 to 33.9 in | XXS | XS | bust 31.5 in, waist 24.3 in, hip 34 in | US 00 |
| S | bust 30.3 to 32.7 in, waist 24 to 26.4 in, hip 33.1 to 35.4 in | XXS | S | bust 31.5 in, waist 24.3 in, hip 34 in | US 00 |
| M | bust 31.9 to 34.3 in, waist 25.6 to 28 in, hip 34.7 to 37 in | XS | M | bust 32.5 to 33.5 in, waist 25.3 to 26.3 in, hip 35 to 36 in | US 0-2 |
| L | bust 33.5 to 35.8 in, waist 27.2 to 29.5 in, hip 36.2 to 38.6 in | S | L | bust 34.5 to 35.5 in, waist 27.3 to 28.3 in, hip 37 to 38 in | US 4-6 |
| XL | bust 35.8 to 38.2 in, waist 29.5 to 31.9 in, hip 38.6 to 40.9 in | M | XL | bust 36.5 to 37.5 in, waist 29.3 to 30.3 in, hip 39 to 40 in | US 8-10 |
| XXL | bust 38.2 to 40.6 in, waist 31.9 to 34.3 in, hip 40.9 to 43.3 in | L | not published | bust 39 to 40.5 in, waist 31.8 to 33.3 in, hip 41.5 to 43 in | US 12-14 |
| 3XL | bust 40.6 to 42.9 in, waist 34.3 to 36.6 in, hip 43.3 to 45.7 in | XL | not published | bust 42 in, waist 34.3 in, hip 44.5 in | US 16-18 |
What wearers say
Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.
Sources
- Uniqlo Japan sizing size guide, read on 2026-09-25. Uniqlo on TrueToSize
- Athleta size guide, read on 2026-09-18. Athleta on TrueToSize