Reformation to Arc'teryx clothing size
The short answer
Reformation XL is Arc'teryx L by the two brands' own charts. 3 of 7 Reformation sizes land on a different label at Arc'teryx.
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 | Arc'teryx, by chart | Same label | Arc'teryx builds it for | Arc'teryx also prints |
|---|---|---|---|---|---|
| XS | bust 33 in, waist 25 in, hip 36 in | XS | XS | bust 33.1 in, waist 26.8 in, hip 36.2 in | not published |
| S | bust 35 in, waist 27 in, hip 38 in | S | S | bust 35 in, waist 28.7 in, hip 38.2 in | not published |
| M | bust 37 in, waist 29 in, hip 40 in | M | M | bust 37 in, waist 30.7 in, hip 40.2 in | not published |
| L | bust 39.5 in, waist 31.5 in, hip 42.5 in | L | L | bust 40.2 in, waist 33.9 in, hip 43.3 in | not published |
| XL | bust 41.5 in, waist 33.5 in, hip 44.5 in | L | XL | bust 40.2 in, waist 33.9 in, hip 43.3 in | not published |
| 1X | bust 45 in, waist 37.5 in, hip 47.5 in | XL | not published | bust 44.1 in, waist 37.8 in, hip 47.2 in | not published |
| 2X | bust 48 in, waist 40.5 in, hip 50.5 in | XXL | not published | bust 48 in, waist 41.7 in, hip 51.2 in | 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
- Arc'teryx size guide, read on 2026-09-18.