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Lululemon to Gymshark leggings size

The short answer

lululemon 4 is Gymshark XXS or XS 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 lululemon size read across to Gymshark. US numeric sizes on the left, Letter on the right.
lululemonlululemon builds it forGymshark, by chartSame labelGymshark builds it forGymshark also prints
0waist 21 in, hip 32 innot madenot publishednot publishednot published
2waist 23 in, hip 33 inXXSXXSwaist 24 in, hip 35.5 inUS numeric 2-4
4waist 25 in, hip 35 inXXS or XSXSwaist 24 in, hip 35.5 inUS numeric 2-4
6waist 27 in, hip 37 inXS or SSwaist 26 in, hip 37.5 inUS numeric 4-6
8waist 29 in, hip 39 inS or MMwaist 28 in, hip 39.5 inUS numeric 6-8
10waist 31 in, hip 41 inM or LLwaist 30 in, hip 41.5 inUS numeric 8-10
12waist 33 in, hip 43 inL or XLXLwaist 32 in, hip 43.5 inUS numeric 10-12
14waist 35 in, hip 45 inXL or XXLXXLwaist 34 in, hip 45.5 inUS numeric 12-14
16waist 38 in, hip 47 innot madenot publishednot publishednot published
18waist 41 in, hip 49 innot madenot publishednot publishednot published
20waist 43 in, hip 51 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 lululemon