Reformation to Whistles clothing size
The short answer
Reformation L is Whistles 16 by the two brands' own charts.
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 | Whistles, by chart | Same label | Whistles builds it for | Whistles also prints |
|---|---|---|---|---|---|
| XS | bust 33 in, waist 25 in, hip 36 in | 08 or 10 | not published | bust 32 in, waist 25.5 in, hip 36.5 in | not published |
| S | bust 35 in, waist 27 in, hip 38 in | 10 or 12 | not published | bust 34 in, waist 27.5 in, hip 38.5 in | not published |
| M | bust 37 in, waist 29 in, hip 40 in | 12 or 14 | not published | bust 36 in, waist 29.5 in, hip 40.5 in | not published |
| L | bust 39.5 in, waist 31.5 in, hip 42.5 in | 16 | not published | bust 40 in, waist 33.5 in, hip 44.5 in | not published |
| XL | bust 41.5 in, waist 33.5 in, hip 44.5 in | 18 or 16 | not published | bust 42.5 in, waist 35.5 in, hip 46.5 in | not published |
| 1X | bust 45 in, waist 37.5 in, hip 47.5 in | 20 | not published | bust 45 in, waist 38 in, hip 49 in | 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
- Whistles size guide, read on 2026-09-18.