SET Active to Girlfriend Collective leggings size

The short answer

SET Active XS is Girlfriend Collective XXS by the two brands' own charts. 2 of 6 SET Active sizes land on a different label at Girlfriend Collective.

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

Every SET Active size read across to Girlfriend Collective. Letter sizes on the left, Letter on the right.
SET Active	SET Active builds it for	Girlfriend Collective, by chart	Same label	Girlfriend Collective builds it for	Girlfriend Collective also prints
XS	waist 22 to 24 in	XXS	XS	waist 22 to 24 in, hip 32 to 34 in	not published
S	waist 25 to 27 in	XS	S	waist 24 to 26 in, hip 34 to 36 in	not published
M	waist 28 to 30 in	M	M	waist 28 to 30.5 in, hip 39 to 41.5 in	not published
L	waist 31 to 33 in	L	L	waist 30.5 to 33 in, hip 41.5 to 44 in	not published
XL	waist 34 to 36 in	XL	XL	waist 33 to 35.5 in, hip 44 to 46.5 in	not published
XXL	waist 37 to 40 in	XXL	XXL	waist 35.5 to 39 in, hip 46.5 to 50 in	not 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

SET Active size guide, read on 2026-09-18.
Girlfriend Collective size guide, read on 2026-09-17. Girlfriend Collective on TrueToSize

Girlfriend Collective to SET Active