US to Letter clothing size
The short answer
By the formula, US 00 is Letter XXS. On brand charts the most common answer is XS (9 of 10 brands), and 3 different answers are in print.
The formula and the brands' most common answer differ on 2 of 12 sizes below. Use the brand's own number for the brand you are buying.
| US | Letter by formula | Most brands print | Other answers in print |
|---|---|---|---|
| 00 | XXS | XS (9 of 10) | XXS: Athleta, Banana Republic, Diane von Furstenberg, Farm Rio, Gap, J.Crew, Under Armour; XXXS: J.Crew, lululemon |
| 0 | XS | XS (9 of 10) | XXS: Athleta, Banana Republic, Diane von Furstenberg, Farm Rio, Gap, J.Crew, Under Armour; XXXS: J.Crew, lululemon |
| 2 | XS | XS (10 of 13) | S: Diane von Furstenberg, Reformation; XXS: lululemon |
| 4 | S | S (11 of 13) | SM: Under Armour; XS: lululemon |
| 6 | S | S (9 of 13) | M: Diane von Furstenberg, Reformation, Sandro; SM: Under Armour |
| 8 | M | M (11 of 13) | L: Sandro; MD: Under Armour |
| 10 | M | M (8 of 13) | L: Diane von Furstenberg, lululemon, Reformation; MD: Under Armour; XL: Sandro |
| 12 | L | L (9 of 12) | XL: lululemon, Reformation; LG: Under Armour |
| 14 | L | L (8 of 12) | XL: Diane von Furstenberg, lululemon; 1X: Reformation; LG: Under Armour |
| 16 | XL | XL (9 of 11) | 1X: lululemon; 2X: Reformation |
| 18 | XL | XL (5 of 9) | 1X: lululemon; 2X: Reformation; XXL: Under Armour; XXL / 1X: J.Crew |
| 20 | XXL | 2X (2 of 6) | XXL: Banana Republic, Gap; 3X: Reformation; 3XL: Under Armour |