Reformation to Banana Republic clothing size
The short answer
Reformation S is Banana Republic 4 or 6 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 | Banana Republic, by chart | Same label | Banana Republic builds it for | Banana Republic also prints |
|---|---|---|---|---|---|
| XS | bust 33 in, waist 25 in, hip 36 in | 0 or 2 | 000 | bust 32.5 in, waist 26 in, hip 35.5 in | Letter XS |
| S | bust 35 in, waist 27 in, hip 38 in | 4 or 6 | not published | bust 34.5 in, waist 28 in, hip 37.5 in | Letter S |
| M | bust 37 in, waist 29 in, hip 40 in | 8 or 10 | not published | bust 36.5 in, waist 30 in, hip 39.5 in | Letter M |
| L | bust 39.5 in, waist 31.5 in, hip 42.5 in | 12 | 10 | bust 39 in, waist 32.5 in, hip 42 in | Letter L |
| XL | bust 41.5 in, waist 33.5 in, hip 44.5 in | 14 or 16 | 12 | bust 40.5 in, waist 34 in, hip 43.5 in | Letter L |
| 1X | bust 45 in, waist 37.5 in, hip 47.5 in | 18 | 14 | bust 44.5 in, waist 38 in, hip 47.5 in | Letter XL |
| 2X | bust 48 in, waist 40.5 in, hip 50.5 in | 20 | not published | bust 47.5 in, waist 41 in, hip 50.5 in | Letter XXL |
| 3X | bust 51 in, waist 43.5 in, hip 53.5 in | not made | 20 | not published | 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
- Reformation size guide, read on 2026-09-18. Reformation on TrueToSize
- Banana Republic size guide, read on 2026-09-18.