Reformation to J.Crew clothing size
The short answer
Reformation S is J.Crew 4 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.
On 2 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.
| Reformation | Reformation builds it for | J.Crew, by chart | Same label | J.Crew builds it for | J.Crew also prints |
|---|---|---|---|---|---|
| XS | bust 33 in, waist 25 in, hip 36 in | 0 | 000 | bust 33 in, waist 25 in | Letter XS · UK 4 · DE 28 · FR 32 · IT 36 · AU 4 · JP 3 |
| S | bust 35 in, waist 27 in, hip 38 in | 4 | not published | bust 35 in, waist 27 in | Letter S · UK 8 · DE 34 · FR 36 · IT 40 · AU 8 · JP 7 |
| M | bust 37 in, waist 29 in, hip 40 in | 8 | not published | bust 37 in, waist 29 in | Letter M · UK 12 · DE 36 · FR 40 · IT 44 · AU 12 · JP 11 |
| L | bust 39.5 in, waist 31.5 in, hip 42.5 in | 12 | 10 | bust 39.5 in, waist 31.5 in | Letter L · UK 16 · DE 40 · FR 44 · IT 48 · AU 16 · JP 15 |
| XL | bust 41.5 in, waist 33.5 in, hip 44.5 in | 14 | 12 | bust 41 in, waist 33 in | Letter L · UK 18 · DE 42 · FR 46 · IT 50 · AU 18 · JP 17 |
| 1X | bust 45 in, waist 37.5 in, hip 47.5 in | 18 or 16 | 14 | bust 46 in, waist 38 in | Letter XXL / 1X · UK 22 · DE 46 · FR 50 · IT 54 · AU 22 · JP 21 |
| 2X | bust 48 in, waist 40.5 in, hip 50.5 in | 20 | not published | bust 48.5 in, waist 40.5 in | Letter 2X · UK 24 · DE 48 · FR 52 · IT 56 · AU 24 · JP 23 |
| 3X | bust 51 in, waist 43.5 in, hip 53.5 in | 22 | 20 | bust 51 in, waist 43 in | Letter 3X |
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
- J.Crew size guide, read on 2026-09-18.