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Old Navy to Gymshark leggings size

The short answer

Old Navy XL is Gymshark XXL by the two brands' own charts. 1 of 6 Old Navy 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 Old Navy size read across to Gymshark. Letter sizes on the left, Letter on the right.
Old NavyOld Navy builds it forGymshark, by chartSame labelGymshark builds it forGymshark also prints
XXSwaist 24 in, hip 34.5 inXXSXXSwaist 24 in, hip 35.5 inUS numeric 2-4
XSwaist 25 to 26 in, hip 35.5 to 36.5 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 30 in, hip 39.5 to 40.5 inMMwaist 30 in, hip 41.5 inUS numeric 8-10
Lwaist 31.5 to 33.5 in, hip 42 to 44 inLLwaist 32 in, hip 43.5 inUS numeric 10-12
XLwaist 36.3 to 39 in, hip 46.5 to 49 inXXLXLwaist 36 in, hip 47.7 inUS numeric 14-16
XXLwaist 42 in, hip 51.5 innot madeXXLnot publishednot published
2Xwaist 42 to 44.3 in, hip 51.5 to 53.8 innot madenot publishednot publishednot published
3Xwaist 46.6 to 49 in, hip 56.1 to 58.5 innot madenot publishednot publishednot published
4Xwaist 51.5 to 54 in, hip 61 to 63.5 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 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 Old Navy