Old Navy to SET Active leggings size

The short answer

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

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

Every Old Navy size read across to SET Active. Letter sizes on the left, Letter on the right.
Old Navy	Old Navy builds it for	SET Active, by chart	Same label	SET Active builds it for	SET Active also prints
XXS	waist 24 in, hip 34.5 in	XS	not published	waist 22 to 24 in	US numeric 00-4
XS	waist 25 to 26 in, hip 35.5 to 36.5 in	S	XS	waist 25 to 27 in	US numeric 4-6
S	waist 27 to 28 in, hip 37.5 to 38.5 in	S or M	S	waist 25 to 27 in	US numeric 4-6
M	waist 29 to 30 in, hip 39.5 to 40.5 in	M	M	waist 28 to 30 in	US numeric 8-10
L	waist 31.5 to 33.5 in, hip 42 to 44 in	L	L	waist 31 to 33 in	US numeric 12-14
XL	waist 36.3 to 39 in, hip 46.5 to 49 in	XXL	XL	waist 37 to 40 in	US numeric 20-22
XXL	waist 42 in, hip 51.5 in	not made	XXL	not published	not published
2X	waist 42 to 44.3 in, hip 51.5 to 53.8 in	not made	not published	not published	not published
3X	waist 46.6 to 49 in, hip 56.1 to 58.5 in	not made	not published	not published	not published
4X	waist 51.5 to 54 in, hip 61 to 63.5 in	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the SET Active 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

Old Navy size guide, read on 2026-09-17. Old Navy on TrueToSize
SET Active size guide, read on 2026-09-18.

SET Active to Old Navy