Brooks Brothers to Gymshark size
The short answer
Brooks Brothers S is Gymshark XS by the two brands' own charts. 2 of 6 Brooks Brothers sizes land on a different label at Gymshark.
Both brands publish the body chest each size is cut for, so every row matches a chest, not a letter.
| Brooks Brothers | Brooks Brothers builds it for | Gymshark, by chart | Same label | Gymshark builds it for | Gymshark also prints |
|---|---|---|---|---|---|
| XS | chest 34 to 36 in, waist 28 to 30 in, sleeve 32 in | XS | XS | chest 37 in, waist 29.5 in | not published |
| S | chest 36 to 38 in, waist 30 to 32 in, sleeve 33 in | XS | S | chest 37 in, waist 29.5 in | not published |
| M | chest 38 to 40 in, waist 32 to 34 in, sleeve 35 in | S | M | chest 39 in, waist 31.5 in | not published |
| L | chest 42 to 44 in, waist 36 to 38 in, sleeve 36 in | L | L | chest 43 in, waist 35.5 in | not published |
| XL | chest 44 to 46 in, waist 40 to 42 in, sleeve 36.5 in | XL | XL | chest 45 in, waist 37.5 in | not published |
| XXL | chest 46 to 48 in, waist 44 to 46 in, sleeve 37 in | XXL | XXL | chest 47 in, waist 39.5 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
- Brooks Brothers size guide, read on 2026-09-18.
- Gymshark size guide, read on 2026-09-18. Gymshark on TrueToSize