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Lululemon to Girlfriend Collective leggings size

The short answer

lululemon 12 is Girlfriend Collective L 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 Girlfriend Collective. US numeric sizes on the left, Letter on the right.
lululemonlululemon builds it forGirlfriend Collective, by chartSame labelGirlfriend Collective builds it forGirlfriend Collective also prints
0waist 21 in, hip 32 inXXSnot publishedwaist 22 to 24 in, hip 32 to 34 innot published
2waist 23 in, hip 33 inXXSXXSwaist 22 to 24 in, hip 32 to 34 innot published
4waist 25 in, hip 35 inXSXSwaist 24 to 26 in, hip 34 to 36 innot published
6waist 27 in, hip 37 inSSwaist 26 to 28 in, hip 36 to 39 innot published
8waist 29 in, hip 39 inMMwaist 28 to 30.5 in, hip 39 to 41.5 innot published
10waist 31 in, hip 41 inLLwaist 30.5 to 33 in, hip 41.5 to 44 innot published
12waist 33 in, hip 43 inLXLwaist 30.5 to 33 in, hip 41.5 to 44 innot published
14waist 35 in, hip 45 inXLXXLwaist 33 to 35.5 in, hip 44 to 46.5 innot published
16waist 38 in, hip 47 inXXLnot publishedwaist 35.5 to 39 in, hip 46.5 to 50 innot published
18waist 41 in, hip 49 inXXXLnot publishedwaist 39 to 42.5 in, hip 50 to 53.5 innot published
20waist 43 in, hip 51 in4XLnot publishedwaist 42.5 to 46 in, hip 53.5 to 57 innot published
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

Girlfriend Collective to lululemon