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Fabletics to Gymshark leggings size

The short answer

Fabletics XL is Gymshark XXL by the two brands' own charts. 1 of 6 Fabletics 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 Fabletics size read across to Gymshark. Letter sizes on the left, Letter on the right.
FableticsFabletics builds it forGymshark, by chartSame labelGymshark builds it forGymshark also prints
XXSwaist 24 to 25 in, hip 33 to 35 inXXSXXSwaist 24 in, hip 35.5 inUS numeric 2-4
XSwaist 25.5 to 26.5 in, hip 36 to 37 inXSXSwaist 26 in, hip 37.5 inUS numeric 4-6
Swaist 27 to 28 in, hip 37.5 to 38.5 inSSwaist 28 in, hip 39.5 inUS numeric 6-8
Mwaist 29 to 31 in, hip 39 to 41 inMMwaist 30 in, hip 41.5 inUS numeric 8-10
Lwaist 32 to 34 in, hip 42 to 44 inL or XLLwaist 32 in, hip 43.5 inUS numeric 10-12
XLwaist 35 to 37 in, hip 45 to 47 inXXLXLwaist 36 in, hip 47.7 inUS numeric 14-16
XXL/1Xwaist 38 to 41 in, hip 48 to 51 innot madenot publishednot publishednot published
2Xwaist 41 to 43 in, hip 51 to 53 innot madenot publishednot publishednot published
3Xwaist 43 to 45 in, hip 53 to 55 innot madenot publishednot publishednot published
4Xwaist 45 to 47 in, hip 55 to 57 innot madenot publishednot publishednot published
5Xwaist 47 to 49 in, hip 57 to 59 innot madenot publishednot publishednot published
6Xwaist 49 to 51 in, hip 59 to 61 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 Fabletics