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Gymshark to Aerie (OFFLINE) leggings size

The short answer

Gymshark XXL is Aerie (OFFLINE) XL by the two brands' own charts. 1 of 7 Gymshark sizes land on a different label at Aerie (OFFLINE).

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 Aerie (OFFLINE). Letter sizes on the left, Letter on the right.
GymsharkGymshark builds it forAerie (OFFLINE), by chartSame labelAerie (OFFLINE) builds it forAerie (OFFLINE) also prints
XXSwaist 24 in, hip 35.5 inXXS or XSXXSwaist 22.5 to 23.5 in, hip 32 to 33 inUS numeric 000-00
XSwaist 26 in, hip 37.5 inXS or SXSwaist 24.5 to 25.5 in, hip 34 to 35 inUS numeric 0-2
Swaist 28 in, hip 39.5 inS or MSwaist 26.5 to 27.5 in, hip 36 to 37 inUS numeric 4-6
Mwaist 30 in, hip 41.5 inM or LMwaist 28.5 to 29.5 in, hip 38 to 39 inUS numeric 8-10
Lwaist 32 in, hip 43.5 inLLwaist 31 to 32.5 in, hip 40.5 to 42 inUS numeric 12-14
XLwaist 34 in, hip 45.5 inXLXLwaist 34 to 36 in, hip 43.5 to 45.5 inUS numeric 16-18
XXLwaist 36 in, hip 47.7 inXLXXLwaist 34 to 36 in, hip 43.5 to 45.5 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

Aerie (OFFLINE) to Gymshark