SET Active to Old Navy leggings size

The short answer

SET Active XS is Old Navy XXS by the two brands' own charts. 3 of 6 SET Active sizes land on a different label at Old Navy.

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 Old Navy. Letter sizes on the left, Letter on the right.
SET Active	SET Active builds it for	Old Navy, by chart	Same label	Old Navy builds it for	Old Navy also prints
XS	waist 22 to 24 in	XXS	XS	waist 24 in, hip 34.5 in	US numeric 00
S	waist 25 to 27 in	XS	S	waist 25 to 26 in, hip 35.5 to 36.5 in	US numeric 0-2
M	waist 28 to 30 in	M	M	waist 29 to 30 in, hip 39.5 to 40.5 in	US numeric 8-10
L	waist 31 to 33 in	L	L	waist 31.5 to 33.5 in, hip 42 to 44 in	US numeric 12-14
XL	waist 34 to 36 in	XL or L	XL	waist 36.3 to 39 in, hip 46.5 to 49 in	US numeric 16-18
XXL	waist 37 to 40 in	XL	XXL	waist 36.3 to 39 in, hip 46.5 to 49 in	US numeric 16-18

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.
Old Navy size guide, read on 2026-09-17. Old Navy on TrueToSize

Old Navy to SET Active