Whistles to Banana Republic clothing size
The short answer
Whistles 12 is Banana Republic 6 or 8 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.
| Whistles | Whistles builds it for | Banana Republic, by chart | Same label | Banana Republic builds it for | Banana Republic also prints |
|---|---|---|---|---|---|
| 04 | bust 30 in, waist 23.5 in, hip 34.5 in | 000 | not published | bust 30.5 in, waist 24 in, hip 33.5 in | Letter XXS |
| 06 | bust 31 in, waist 24.5 in, hip 35.5 in | 000 or 00 | not published | bust 30.5 in, waist 24 in, hip 33.5 in | Letter XXS |
| 08 | bust 32 in, waist 25.5 in, hip 36.5 in | 00 or 0 | not published | bust 31.5 in, waist 25 in, hip 34.5 in | Letter XXS |
| 10 | bust 34 in, waist 27.5 in, hip 38.5 in | 2 or 4 | not published | bust 33.5 in, waist 27 in, hip 36.5 in | Letter XS |
| 12 | bust 36 in, waist 29.5 in, hip 40.5 in | 6 or 8 | not published | bust 35.5 in, waist 29 in, hip 38.5 in | Letter S |
| 14 | bust 38 in, waist 31.5 in, hip 42.5 in | 10 | not published | bust 37.5 in, waist 31 in, hip 40.5 in | Letter M |
| 16 | bust 40 in, waist 33.5 in, hip 44.5 in | 14 | not published | bust 40.5 in, waist 34 in, hip 43.5 in | Letter L |
| 18 | bust 42.5 in, waist 35.5 in, hip 46.5 in | 16 | not published | bust 42.5 in, waist 36 in, hip 45.5 in | Letter XL |
| 20 | bust 45 in, waist 38 in, hip 49 in | 18 | not published | bust 44.5 in, waist 38 in, hip 47.5 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
- Whistles size guide, read on 2026-09-18.
- Banana Republic size guide, read on 2026-09-18.