Reformation to Uniqlo clothing size
The short answer
Reformation XS is Uniqlo M by the two brands' own charts. 5 of 5 Reformation sizes land on a different label at Uniqlo.
Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.
On 5 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.
| Reformation | Reformation builds it for | Uniqlo Japan sizing, by chart | Same label | Uniqlo builds it for | Uniqlo also prints |
|---|---|---|---|---|---|
| XS | bust 33 in, waist 25 in, hip 36 in | M | XS | bust 31.9 to 34.3 in, waist 25.6 to 28 in, hip 34.7 to 37 in | JP 9 |
| S | bust 35 in, waist 27 in, hip 38 in | L | S | bust 33.5 to 35.8 in, waist 27.2 to 29.5 in, hip 36.2 to 38.6 in | JP 11 |
| M | bust 37 in, waist 29 in, hip 40 in | XL | M | bust 35.8 to 38.2 in, waist 29.5 to 31.9 in, hip 38.6 to 40.9 in | JP 13 |
| L | bust 39.5 in, waist 31.5 in, hip 42.5 in | XXL | L | bust 38.2 to 40.6 in, waist 31.9 to 34.3 in, hip 40.9 to 43.3 in | JP 15 |
| XL | bust 41.5 in, waist 33.5 in, hip 44.5 in | 3XL | XL | bust 40.6 to 42.9 in, waist 34.3 to 36.6 in, hip 43.3 to 45.7 in | JP 17 |
| 1X | bust 45 in, waist 37.5 in, hip 47.5 in | not made | not published | not published | not published |
| 2X | bust 48 in, waist 40.5 in, hip 50.5 in | not made | not published | not published | not published |
| 3X | bust 51 in, waist 43.5 in, hip 53.5 in | not made | not published | not published | not published |
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
- Reformation size guide, read on 2026-09-18. Reformation on TrueToSize
- Uniqlo Japan sizing size guide, read on 2026-09-25. Uniqlo on TrueToSize