Aerie (OFFLINE) to Oysho leggings size

The short answer

Aerie (OFFLINE) XS is Oysho XXS by the two brands' own charts. 1 of 7 Aerie (OFFLINE) sizes land on a different label at Oysho.

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 Oysho. Letter sizes on the left, Letter on the right.
Aerie (OFFLINE)	Aerie (OFFLINE) builds it for	Oysho, by chart	Same label	Oysho builds it for	Oysho also prints
XXS	waist 22.5 to 23.5 in, hip 32 to 33 in	XXS	XXS	waist 24 to 25 in, hip 36 to 37 in	not published
XS	waist 24.5 to 25.5 in, hip 34 to 35 in	XXS	XS	waist 24 to 25 in, hip 36 to 37 in	not published
S	waist 26.5 to 27.5 in, hip 36 to 37 in	S	S	waist 26 to 27 in, hip 38 to 39 in	not published
M	waist 28.5 to 29.5 in, hip 38 to 39 in	M	M	waist 27 to 29 in, hip 39 to 41 in	not published
L	waist 31 to 32.5 in, hip 40.5 to 42 in	L	L	waist 30 to 33 in, hip 42 to 45 in	not published
XL	waist 34 to 36 in, hip 43.5 to 45.5 in	XL	XL	waist 33 to 35 in, hip 45 to 47 in	not published
XXL	waist 38 in, hip 47.5 in	XXL	XXL	waist 36 to 39 in, hip 48 to 51 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

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

Oysho to Aerie (OFFLINE)