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Gymshark to Sweaty Betty leggings size

The short answer

Gymshark M is Sweaty Betty M or L by the two brands' own charts. 0 of 7 Gymshark sizes land on a different label at Sweaty Betty.

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 Sweaty Betty. Letter sizes on the left, Letter on the right.
GymsharkGymshark builds it forSweaty Betty, by chartSame labelSweaty Betty builds it forSweaty Betty also prints
XXSwaist 24 in, hip 35.5 inXXS or XSXXSwaist 23 in, hip 34 inUS numeric 2
XSwaist 26 in, hip 37.5 inXS or SXSwaist 25 in, hip 36 inUS numeric 4
Swaist 28 in, hip 39.5 inS or MSwaist 27 in, hip 38 inUS numeric 6
Mwaist 30 in, hip 41.5 inM or LMwaist 29 in, hip 40 inUS numeric 8
Lwaist 32 in, hip 43.5 inL or XLLwaist 31 in, hip 42 inUS numeric 10
XLwaist 34 in, hip 45.5 inXLXLwaist 33 in, hip 44 inUS numeric 12
XXLwaist 36 in, hip 47.7 inXXLXXLwaist 36 in, hip 46.5 inUS numeric 14
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

Sweaty Betty to Gymshark