Uniqlo to Reformation clothing size
The short answer
Uniqlo S is Reformation XS by the two brands' own charts. 6 of 6 Uniqlo sizes land on a different label at Reformation.
Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.
On 3 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 | Reformation, by chart | Same label | Reformation builds it for | Reformation also prints |
|---|---|---|---|---|---|
| XS | bust 28.7 to 31.1 in, waist 22.4 to 24.8 in, hip 31.5 to 33.9 in | not made | XS | not published | not published |
| S | bust 30.3 to 32.7 in, waist 24 to 26.4 in, hip 33.1 to 35.4 in | XS | S | bust 33 in, waist 25 in, hip 36 in | US 0 |
| M | bust 31.9 to 34.3 in, waist 25.6 to 28 in, hip 34.7 to 37 in | XS | M | bust 33 in, waist 25 in, hip 36 in | US 0 |
| 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 35 in, waist 27 in, hip 38 in | US 2/4 |
| 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 37 in, waist 29 in, hip 40 in | US 6/8 |
| 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 39.5 in, waist 31.5 in, hip 42.5 in | US 10 |
| 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 41.5 in, waist 33.5 in, hip 44.5 in | US 12 |
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
- Reformation size guide, read on 2026-09-18. Reformation on TrueToSize