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SKIMS to Gymshark leggings size

The short answer

SKIMS XS is Gymshark XXS or XS by the two brands' own charts. 2 of 6 SKIMS sizes land on a different label at Gymshark.

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

Every SKIMS size read across to Gymshark. Letter sizes on the left, Letter on the right.
SKIMSSKIMS builds it forGymshark, by chartSame labelGymshark builds it forGymshark also prints
XXSwaist 23 to 24 in, hip 31 to 34 inXXSXXSwaist 24 in, hip 35.5 inUS numeric 2-4
XSwaist 24 to 26 in, hip 34 to 36.5 inXXS or XSXSwaist 24 in, hip 35.5 inUS numeric 2-4
Swaist 26.5 to 28.5 in, hip 37 to 39 inSSwaist 28 in, hip 39.5 inUS numeric 6-8
Mwaist 29 to 31 in, hip 39.5 to 41.5 inMMwaist 30 in, hip 41.5 inUS numeric 8-10
Lwaist 31.5 to 34.5 in, hip 42 to 44 inL or XLLwaist 32 in, hip 43.5 inUS numeric 10-12
XLwaist 35 to 38 in, hip 44.5 to 47.5 inXXLXLwaist 36 in, hip 47.7 inUS numeric 14-16
2Xwaist 38.5 to 41.5 in, hip 48 to 51 innot madenot publishednot publishednot published
3Xwaist 42 to 45.5 in, hip 51.5 to 55 innot madenot publishednot publishednot published
4Xwaist 46 to 49.5 in, hip 55.5 to 59 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 3 sizes have no counterpart on the Gymshark chart. 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

Gymshark to SKIMS