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Gymshark to SKIMS leggings size

The short answer

Gymshark XL is SKIMS L by the two brands' own charts. 2 of 7 Gymshark sizes land on a different label at SKIMS.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every Gymshark size read across to SKIMS. Letter sizes on the left, Letter on the right.
GymsharkGymshark builds it forSKIMS, by chartSame labelSKIMS builds it forSKIMS also prints
XXSwaist 24 in, hip 35.5 inXXSXXSwaist 23 to 24 in, hip 31 to 34 inUS numeric 00
XSwaist 26 in, hip 37.5 inXSXSwaist 24 to 26 in, hip 34 to 36.5 inUS numeric 0-2
Swaist 28 in, hip 39.5 inSSwaist 26.5 to 28.5 in, hip 37 to 39 inUS numeric 4-6
Mwaist 30 in, hip 41.5 inMMwaist 29 to 31 in, hip 39.5 to 41.5 inUS numeric 8-10
Lwaist 32 in, hip 43.5 inLLwaist 31.5 to 34.5 in, hip 42 to 44 inUS numeric 12-14
XLwaist 34 in, hip 45.5 inLXLwaist 31.5 to 34.5 in, hip 42 to 44 inUS numeric 12-14
XXLwaist 36 in, hip 47.7 inXLnot publishedwaist 35 to 38 in, hip 44.5 to 47.5 inUS numeric 16
Tinted rows change label or sit between two sizes. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

SKIMS to Gymshark