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Nike to Gymshark leggings size

The short answer

Nike XS is Gymshark XXS or XS by the two brands' own charts. 2 of 6 Nike 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 Nike size read across to Gymshark. Letter sizes on the left, Letter on the right.
NikeNike builds it forGymshark, by chartSame labelGymshark builds it forGymshark also prints
XXSwaist 21.3 to 23.5 in, hip 30.5 to 33 inXXSXXSwaist 24 in, hip 35.5 inUS numeric 2-4
XSwaist 23.5 to 26 in, hip 33 to 35.5 inXXS or XSXSwaist 24 in, hip 35.5 inUS numeric 2-4
Swaist 26 to 29 in, hip 35.5 to 38.5 inSSwaist 28 in, hip 39.5 inUS numeric 6-8
Mwaist 29 to 31.5 in, hip 38.5 to 41 inMMwaist 30 in, hip 41.5 inUS numeric 8-10
Lwaist 31.5 to 34.5 in, hip 41 to 44 inL or XLLwaist 32 in, hip 43.5 inUS numeric 10-12
XLwaist 34.5 to 38.5 in, hip 44 to 47 inXXLXLwaist 36 in, hip 47.7 inUS numeric 14-16
XXLwaist 38.5 to 42.5 in, hip 47 to 50 innot madeXXLnot publishednot published
0Xwaist 40 to 43 in, hip 48 to 51 innot madenot publishednot publishednot published
1Xwaist 43 to 45.5 in, hip 51 to 54 innot madenot publishednot publishednot published
2Xwaist 45.5 to 49 in, hip 54 to 57 innot madenot publishednot publishednot published
3Xwaist 49 to 53 in, hip 57 to 61 innot madenot publishednot publishednot published
4Xwaist 53 to 57 in, hip 61 to 65 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 6 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 Nike