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Girlfriend Collective to Smartwool leggings size

The short answer

Girlfriend Collective M is Smartwool S by the two brands' own charts. 6 of 7 Girlfriend Collective sizes land on a different label at Smartwool.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

On 2 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

Every Girlfriend Collective size read across to Smartwool. Letter sizes on the left, Letter on the right.
Girlfriend CollectiveGirlfriend Collective builds it forSmartwool, by chartSame labelSmartwool builds it forSmartwool also prints
XXSwaist 22 to 24 in, hip 32 to 34 innot madenot publishednot publishednot published
XSwaist 24 to 26 in, hip 34 to 36 innot madenot publishednot publishednot published
Swaist 26 to 28 in, hip 36 to 39 inSSwaist 29 to 31 in, hip 36 to 38 innot published
Mwaist 28 to 30.5 in, hip 39 to 41.5 inSMwaist 29 to 31 in, hip 36 to 38 innot published
Lwaist 30.5 to 33 in, hip 41.5 to 44 inMLwaist 32 to 34 in, hip 39 to 41 innot published
XLwaist 33 to 35.5 in, hip 44 to 46.5 inMXLwaist 32 to 34 in, hip 39 to 41 innot published
XXLwaist 35.5 to 39 in, hip 46.5 to 50 inLXXLwaist 35 to 37 in, hip 42 to 44 innot published
XXXLwaist 39 to 42.5 in, hip 50 to 53.5 inXXLnot publishedwaist 41 to 44 in, hip 49 to 51 innot published
4XLwaist 42.5 to 46 in, hip 53.5 to 57 inXXLnot publishedwaist 41 to 44 in, hip 49 to 51 innot published
5XLwaist 46 to 49.5 in, hip 57 to 60.5 innot madenot publishednot publishednot published
6XLwaist 49.5 to 53 in, hip 60.5 to 64 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Smartwool 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

Smartwool to Girlfriend Collective