J.Crew to Under Armour clothing size
The short answer
J.Crew 000 is Under Armour XXS 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.
| J.Crew | J.Crew builds it for | Under Armour, by chart | Same label | Under Armour builds it for | Under Armour also prints |
|---|---|---|---|---|---|
| 000 | bust 31 in, waist 23 in | XXS | not published | bust 31 to 32.5 in, waist 24.5 to 25.5 in | US 00 |
| 000 | bust 31 in, waist 23 in | XXS | not published | bust 31 to 32.5 in, waist 24.5 to 25.5 in | US 00 |
| 000 | bust 31 in, waist 23 in | XXS | not published | bust 31 to 32.5 in, waist 24.5 to 25.5 in | US 00 |
| 2 | bust 34 in, waist 26 in | SM | XS | bust 33.5 to 36 in, waist 27 to 29 in | US 4-6 |
| 4 | bust 35 in, waist 27 in | SM | not published | bust 33.5 to 36 in, waist 27 to 29 in | US 4-6 |
| 6 | bust 36 in, waist 28 in | MD | not published | bust 36 to 38 in, waist 29 to 31 in | US 8-10 |
| 8 | bust 37 in, waist 29 in | MD | not published | bust 36 to 38 in, waist 29 to 31 in | US 8-10 |
| 10 | bust 38 in, waist 30 in | MD | not published | bust 36 to 38 in, waist 29 to 31 in | US 8-10 |
| 12 | bust 39.5 in, waist 31.5 in | LG | not published | bust 38 to 41 in, waist 31 to 34 in | US 12-14 |
| 14 | bust 41 in, waist 33 in | LG | not published | bust 38 to 41 in, waist 31 to 34 in | US 12-14 |
| 16 | bust 43.5 in, waist 35.5 in | XL | XL | bust 41 to 44 in, waist 34 to 37 in | US 16 |
| 18 | bust 46 in, waist 38 in | XXL | not published | bust 44 to 47 in, waist 37 to 40 in | US 18 |
| 20 | bust 48.5 in, waist 40.5 in | 3XL | not published | bust 47 to 50 in, waist 40 to 43 in | US 20 |
| 22 | bust 51 in, waist 43 in | 3XL | not published | bust 47 to 50 in, waist 40 to 43 in | US 20 |
| 24 | bust 53.5 in, waist 45.5 in | not made | not published | 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
- J.Crew size guide, read on 2026-09-18.
- Under Armour size guide, read on 2026-09-18. Under Armour on TrueToSize