Reformation to lululemon clothing size
The short answer
Reformation XS is lululemon S by the two brands' own charts. 6 of 8 Reformation sizes land on a different label at lululemon.
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 | lululemon, by chart | Same label | lululemon builds it for | lululemon also prints |
|---|---|---|---|---|---|
| XS | bust 33 in, waist 25 in, hip 36 in | S | XS | bust 33 to 34 in | US 6 |
| S | bust 35 in, waist 27 in, hip 38 in | M | S | bust 35 to 36 in | US 8 |
| M | bust 37 in, waist 29 in, hip 40 in | L | M | bust 37 to 38.5 in | US 10 |
| L | bust 39.5 in, waist 31.5 in, hip 42.5 in | XL or L | L | bust 40 to 42 in | US 12-14 |
| XL | bust 41.5 in, waist 33.5 in, hip 44.5 in | XL | XL | bust 40 to 42 in | US 12-14 |
| 1X | bust 45 in, waist 37.5 in, hip 47.5 in | 1X | 1X | bust 45 to 47 in | US 16-18 |
| 2X | bust 48 in, waist 40.5 in, hip 50.5 in | 1X or 2X | 2X | bust 45 to 47 in | US 16-18 |
| 3X | bust 51 in, waist 43.5 in, hip 53.5 in | 2X | not published | bust 49 to 51 in | US 20-22 |
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
- lululemon size guide, read on 2026-09-18. lululemon on TrueToSize