Banana Republic to Under Armour clothing size
The short answer
Banana Republic 4 is Under Armour SM 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.
| Banana Republic | Banana Republic builds it for | Under Armour, by chart | Same label | Under Armour builds it for | Under Armour also prints |
|---|---|---|---|---|---|
| 000 | bust 30.5 in, waist 24 in, hip 33.5 in | XXS | XXS | bust 31 to 32.5 in, waist 24.5 to 25.5 in | US 00 |
| 000 | bust 30.5 in, waist 24 in, hip 33.5 in | XXS | XXS | bust 31 to 32.5 in, waist 24.5 to 25.5 in | US 00 |
| 000 | bust 30.5 in, waist 24 in, hip 33.5 in | XXS | XXS | bust 31 to 32.5 in, waist 24.5 to 25.5 in | US 00 |
| 2 | bust 33.5 in, waist 27 in, hip 36.5 in | XS | XS | bust 32.5 to 33.5 in, waist 25.5 to 27 in | US 0-2 |
| 4 | bust 34.5 in, waist 28 in, hip 37.5 in | SM | not published | bust 33.5 to 36 in, waist 27 to 29 in | US 4-6 |
| 6 | bust 35.5 in, waist 29 in, hip 38.5 in | SM | not published | bust 33.5 to 36 in, waist 27 to 29 in | US 4-6 |
| 8 | bust 36.5 in, waist 30 in, hip 39.5 in | MD | not published | bust 36 to 38 in, waist 29 to 31 in | US 8-10 |
| 10 | bust 37.5 in, waist 31 in, hip 40.5 in | MD | not published | bust 36 to 38 in, waist 29 to 31 in | US 8-10 |
| 12 | bust 39 in, waist 32.5 in, hip 42 in | LG | not published | bust 38 to 41 in, waist 31 to 34 in | US 12-14 |
| 14 | bust 40.5 in, waist 34 in, hip 43.5 in | LG | not published | bust 38 to 41 in, waist 31 to 34 in | US 12-14 |
| 16 | bust 42.5 in, waist 36 in, hip 45.5 in | XL | XL | bust 41 to 44 in, waist 34 to 37 in | US 16 |
| 18 | bust 44.5 in, waist 38 in, hip 47.5 in | XXL | XL | bust 44 to 47 in, waist 37 to 40 in | US 18 |
| 20 | bust 47.5 in, waist 41 in, hip 50.5 in | 3XL | XXL | bust 47 to 50 in, waist 40 to 43 in | US 20 |
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
- Banana Republic size guide, read on 2026-09-18.
- Under Armour size guide, read on 2026-09-18. Under Armour on TrueToSize