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Gymshark to lululemon leggings size

The short answer

Gymshark XXS is lululemon 2 or 4 by the two brands' own charts.

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 lululemon. Letter sizes on the left, US numeric on the right.
GymsharkGymshark builds it forlululemon, by chartSame labellululemon builds it forlululemon also prints
XXSwaist 24 in, hip 35.5 in2 or 4not publishedwaist 23 in, hip 33 inLetter XXS
XSwaist 26 in, hip 37.5 in4 or 6not publishedwaist 25 in, hip 35 inLetter XS
Swaist 28 in, hip 39.5 in6 or 8not publishedwaist 27 in, hip 37 inLetter S
Mwaist 30 in, hip 41.5 in8 or 10not publishedwaist 29 in, hip 39 inLetter M
Lwaist 32 in, hip 43.5 in10 or 12not publishedwaist 31 in, hip 41 inLetter L
XLwaist 34 in, hip 45.5 in12 or 14not publishedwaist 33 in, hip 43 inLetter XL
XXLwaist 36 in, hip 47.7 in14not publishedwaist 35 in, hip 45 inLetter XXL
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

lululemon to Gymshark