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Gymshark to Fabletics leggings size

The short answer

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

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 Fabletics. Letter sizes on the left, Letter on the right.
GymsharkGymshark builds it forFabletics, by chartSame labelFabletics builds it forFabletics also prints
XXSwaist 24 in, hip 35.5 inXXSXXSwaist 24 to 25 in, hip 33 to 35 inUS numeric 00
XSwaist 26 in, hip 37.5 inXSXSwaist 25.5 to 26.5 in, hip 36 to 37 inUS numeric 0-2
Swaist 28 in, hip 39.5 inSSwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
Mwaist 30 in, hip 41.5 inMMwaist 29 to 31 in, hip 39 to 41 inUS numeric 8-10
Lwaist 32 in, hip 43.5 inLLwaist 32 to 34 in, hip 42 to 44 inUS numeric 12-14
XLwaist 34 in, hip 45.5 inLXLwaist 32 to 34 in, hip 42 to 44 inUS numeric 12-14
XXLwaist 36 in, hip 47.7 inXLXXL/1Xwaist 35 to 37 in, hip 45 to 47 inUS numeric 16-18
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

Fabletics to Gymshark