Reformation to Athleta clothing size
The short answer
Reformation 3X is Athleta 2X by the two brands' own charts. 1 of 8 Reformation 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.
| Reformation | Reformation builds it for | Athleta, by chart | Same label | Athleta builds it for | Athleta also prints |
|---|---|---|---|---|---|
| XS | bust 33 in, waist 25 in, hip 36 in | XS | XS | bust 32.5 to 33.5 in, waist 25.3 to 26.3 in, hip 35 to 36 in | US 0-2 |
| S | bust 35 in, waist 27 in, hip 38 in | S | S | bust 34.5 to 35.5 in, waist 27.3 to 28.3 in, hip 37 to 38 in | US 4-6 |
| M | bust 37 in, waist 29 in, hip 40 in | M | M | bust 36.5 to 37.5 in, waist 29.3 to 30.3 in, hip 39 to 40 in | US 8-10 |
| L | bust 39.5 in, waist 31.5 in, hip 42.5 in | L | L | bust 39 to 40.5 in, waist 31.8 to 33.3 in, hip 41.5 to 43 in | US 12-14 |
| XL | bust 41.5 in, waist 33.5 in, hip 44.5 in | XL | XL | bust 42 in, waist 34.3 in, hip 44.5 in | US 16-18 |
| 1X | bust 45 in, waist 37.5 in, hip 47.5 in | 1X | 1X | bust 44.3 to 46.3 in, waist 38 to 40 in, hip 47.3 to 49.3 in | US 16W-18W |
| 2X | bust 48 in, waist 40.5 in, hip 50.5 in | 2X | 2X | bust 48.3 to 50.8 in, waist 42 to 44.5 in, hip 51.3 to 53.8 in | US 20W-22W |
| 3X | bust 51 in, waist 43.5 in, hip 53.5 in | 2X | 3X | bust 48.3 to 50.8 in, waist 42 to 44.5 in, hip 51.3 to 53.8 in | US 20W-22W |
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
- Athleta size guide, read on 2026-09-18. Athleta on TrueToSize