Aerie (OFFLINE) to Athleta leggings size

The short answer

Aerie (OFFLINE) XXL is Athleta 1X by the two brands' own charts. 1 of 7 Aerie (OFFLINE) sizes land on a different label at Athleta.

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

Every Aerie (OFFLINE) size read across to Athleta. Letter sizes on the left, Letter on the right.
Aerie (OFFLINE)	Aerie (OFFLINE) builds it for	Athleta, by chart	Same label	Athleta builds it for	Athleta also prints
XXS	waist 22.5 to 23.5 in, hip 32 to 33 in	XXS	XXS	waist 24.3 in, hip 34 in	US numeric 00
XS	waist 24.5 to 25.5 in, hip 34 to 35 in	XS	XS	waist 25.3 to 26.3 in, hip 35 to 36 in	US numeric 0-2
S	waist 26.5 to 27.5 in, hip 36 to 37 in	S	S	waist 27.3 to 28.3 in, hip 37 to 38 in	US numeric 4-6
M	waist 28.5 to 29.5 in, hip 38 to 39 in	M	M	waist 29.3 to 30.3 in, hip 39 to 40 in	US numeric 8-10
L	waist 31 to 32.5 in, hip 40.5 to 42 in	L	L	waist 31.8 to 33.3 in, hip 41.5 to 43 in	US numeric 12-14
XL	waist 34 to 36 in, hip 43.5 to 45.5 in	XL	XL	waist 34.3 in, hip 44.5 in	US numeric 16-18
XXL	waist 38 in, hip 47.5 in	1X	not published	waist 38 to 40 in, hip 47.3 to 49.3 in	US numeric 16W-18W

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

Aerie (OFFLINE) size guide, read on 2026-09-18. Aerie (OFFLINE) on TrueToSize
Athleta size guide, read on 2026-09-17. Athleta on TrueToSize

Athleta to Aerie (OFFLINE)