Lacoste to Under Armour size
The short answer
Lacoste S is Under Armour SM by the two brands' own charts. 8 of 10 Lacoste sizes land on a different label at Under Armour.
Both brands publish the body chest each size is cut for, so every row matches a chest, not a letter.
| Lacoste | Lacoste builds it for | Under Armour, by chart | Same label | Under Armour builds it for | Under Armour also prints |
|---|---|---|---|---|---|
| XS | chest 34 in, waist 28 in | XS | XS | chest 31 to 34 in, waist 28 to 29 in | not published |
| S | chest 35 to 37 in, waist 30 to 31 in | SM | not published | chest 34 to 37 in, waist 29 to 31 in | not published |
| M | chest 38 to 40 in, waist 33 to 35 in | MD | not published | chest 37 to 41 in, waist 31 to 34 in | not published |
| L | chest 41 to 43 in, waist 36 to 38 in | LG | not published | chest 41 to 44 in, waist 34 to 37 in | not published |
| XL | chest 44 to 46 in, waist 39 to 42 in | XL | XL | chest 44 to 48 in, waist 37 to 41 in | not published |
| 2XL | chest 48 to 49 in, waist 44 to 46 in | XXL | XXL | chest 48 to 52 in, waist 41 to 45.5 in | not published |
| 3XL | chest 51 in, waist 48 in | XXL | 3XL | chest 48 to 52 in, waist 41 to 45.5 in | not published |
| 4X | chest 53 in, waist 50 in | 3XL | not published | chest 52 to 56 in, waist 45.5 to 50 in | not published |
| 1XG | chest 55 in, waist 52 in | 3XL | not published | chest 52 to 56 in, waist 45.5 to 50 in | not published |
| 2XG | chest 57 in, waist 54 in | 4XL | not published | chest 56 to 60 in, waist 50 to 54.5 in | 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
- Lacoste size guide, read on 2026-09-18.
- Under Armour size guide, read on 2026-09-18. Under Armour on TrueToSize