Under Armour to Banana Republic clothing size
The short answer
Under Armour XS is Banana Republic 0 or 2 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.
| Under Armour | Under Armour builds it for | Banana Republic, by chart | Same label | Banana Republic builds it for | Banana Republic also prints |
|---|---|---|---|---|---|
| XXS | bust 31 to 32.5 in, waist 24.5 to 25.5 in | 00 | 000 | bust 31.5 in, waist 25 in, hip 34.5 in | Letter XXS |
| XS | bust 32.5 to 33.5 in, waist 25.5 to 27 in | 0 or 2 | not published | bust 32.5 in, waist 26 in, hip 35.5 in | Letter XS |
| SM | bust 33.5 to 36 in, waist 27 to 29 in | 4 | not published | bust 34.5 in, waist 28 in, hip 37.5 in | Letter S |
| MD | bust 36 to 38 in, waist 29 to 31 in | 8 or 10 | not published | bust 36.5 in, waist 30 in, hip 39.5 in | Letter M |
| LG | bust 38 to 41 in, waist 31 to 34 in | 12 | not published | bust 39 in, waist 32.5 in, hip 42 in | Letter L |
| XL | bust 41 to 44 in, waist 34 to 37 in | 16 | 16 | bust 42.5 in, waist 36 in, hip 45.5 in | Letter XL |
| XXL | bust 44 to 47 in, waist 37 to 40 in | 18 | 18 | bust 44.5 in, waist 38 in, hip 47.5 in | Letter XL |
| 3XL | bust 47 to 50 in, waist 40 to 43 in | 20 | 20 | bust 47.5 in, waist 41 in, hip 50.5 in | Letter XXL |
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
- Under Armour size guide, read on 2026-09-18. Under Armour on TrueToSize
- Banana Republic size guide, read on 2026-09-18.