Reiss to Banana Republic clothing size
The short answer
Reiss 4 is Banana Republic 000 or 00 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 | Banana Republic, by chart | Same label | Banana Republic builds it for | Banana Republic also prints |
|---|---|---|---|---|---|
| 4 | bust 31 in, waist 24 in, hip 34 in | 000 or 00 | 000 | bust 30.5 in, waist 24 in, hip 33.5 in | Letter XXS |
| 6 | bust 32 in, waist 25 in, hip 35 in | 00 or 0 | 2 | bust 31.5 in, waist 25 in, hip 34.5 in | Letter XXS |
| 8 | bust 33 in, waist 26 in, hip 36 in | 0 or 2 | 4 | bust 32.5 in, waist 26 in, hip 35.5 in | Letter XS |
| 10 | bust 35 in, waist 28 in, hip 38 in | 4 or 6 | 6 | bust 34.5 in, waist 28 in, hip 37.5 in | Letter S |
| 12 | bust 37 in, waist 30 in, hip 40 in | 8 or 10 | 8 | bust 36.5 in, waist 30 in, hip 39.5 in | Letter M |
| 14 | bust 39 in, waist 31.5 in, hip 42 in | 12 | 10 | bust 39 in, waist 32.5 in, hip 42 in | Letter L |
| 16 | bust 41 in, waist 33.5 in, hip 44 in | 14 | 12 | bust 40.5 in, waist 34 in, hip 43.5 in | Letter L |
| 18 | bust 43 in, waist 36 in, hip 46.5 in | 16 | 14 | bust 42.5 in, waist 36 in, hip 45.5 in | Letter XL |
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.
- Banana Republic size guide, read on 2026-09-18.