Reiss to J.Crew clothing size
The short answer
Reiss 4 is J.Crew 000 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.
| Reiss | Reiss builds it for | J.Crew, by chart | Same label | J.Crew builds it for | J.Crew also prints |
|---|---|---|---|---|---|
| 4 | bust 31 in, waist 24 in, hip 34 in | 000 | 000 | bust 31 in, waist 23 in | Letter XXXS · UK 0 · DE 24 · FR 28 · IT 32 · AU 0 · JP 1 |
| 6 | bust 32 in, waist 25 in, hip 35 in | 00 | 2 | bust 32 in, waist 24 in | Letter XXS · UK 2 · DE 26 · FR 30 · IT 34 · AU 2 · JP 1 |
| 8 | bust 33 in, waist 26 in, hip 36 in | 0 | 4 | bust 33 in, waist 25 in | Letter XS · UK 4 · DE 28 · FR 32 · IT 36 · AU 4 · JP 3 |
| 10 | bust 35 in, waist 28 in, hip 38 in | 4 | 6 | bust 35 in, waist 27 in | Letter S · UK 8 · DE 34 · FR 36 · IT 40 · AU 8 · JP 7 |
| 12 | bust 37 in, waist 30 in, hip 40 in | 8 | 8 | bust 37 in, waist 29 in | Letter M · UK 12 · DE 36 · FR 40 · IT 44 · AU 12 · JP 11 |
| 14 | bust 39 in, waist 31.5 in, hip 42 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 |
| 16 | bust 41 in, waist 33.5 in, hip 44 in | 14 | 12 | bust 41 in, waist 33 in | Letter L · UK 18 · DE 42 · FR 46 · IT 50 · AU 18 · JP 17 |
| 18 | bust 43 in, waist 36 in, hip 46.5 in | 16 | 14 | bust 43.5 in, waist 35.5 in | Letter XL · UK 20 · DE 44 · FR 48 · IT 52 · AU 20 · JP 19 |
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
- Reiss size guide, read on 2026-09-18.
- J.Crew size guide, read on 2026-09-18.