Reiss to Whistles clothing size
The short answer
Reiss 4 is Whistles 06 by the two brands' own charts. 3 of 8 Reiss sizes land on a different label at Whistles.
Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.
| Reiss | Reiss builds it for | Whistles, by chart | Same label | Whistles builds it for | Whistles also prints |
|---|---|---|---|---|---|
| 4 | bust 31 in, waist 24 in, hip 34 in | 06 | 04 | bust 31 in, waist 24.5 in, hip 35.5 in | not published |
| 6 | bust 32 in, waist 25 in, hip 35 in | 08 | 06 | bust 32 in, waist 25.5 in, hip 36.5 in | not published |
| 8 | bust 33 in, waist 26 in, hip 36 in | 08 or 10 | 08 | bust 32 in, waist 25.5 in, hip 36.5 in | not published |
| 10 | bust 35 in, waist 28 in, hip 38 in | 10 or 12 | 10 | bust 34 in, waist 27.5 in, hip 38.5 in | not published |
| 12 | bust 37 in, waist 30 in, hip 40 in | 12 or 14 | 12 | bust 36 in, waist 29.5 in, hip 40.5 in | not published |
| 14 | bust 39 in, waist 31.5 in, hip 42 in | 14 or 16 | 14 | bust 38 in, waist 31.5 in, hip 42.5 in | not published |
| 16 | bust 41 in, waist 33.5 in, hip 44 in | 16 or 18 | 16 | bust 40 in, waist 33.5 in, hip 44.5 in | not published |
| 18 | bust 43 in, waist 36 in, hip 46.5 in | 18 | 18 | bust 42.5 in, waist 35.5 in, hip 46.5 in | 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
- Reiss size guide, read on 2026-09-18.
- Whistles size guide, read on 2026-09-18.