Oysho to SET Active leggings size

The short answer

Oysho XXS is SET Active XS or S by the two brands' own charts. 2 of 7 Oysho 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 Oysho size read across to SET Active. Letter sizes on the left, Letter on the right.
Oysho	Oysho builds it for	SET Active, by chart	Same label	SET Active builds it for	SET Active also prints
XXS	waist 24 to 25 in, hip 36 to 37 in	XS or S	not published	waist 22 to 24 in	US numeric 00-4
XS	waist 25 to 26 in, hip 37 to 38 in	S	XS	waist 25 to 27 in	US numeric 4-6
S	waist 26 to 27 in, hip 38 to 39 in	S	S	waist 25 to 27 in	US numeric 4-6
M	waist 27 to 29 in, hip 39 to 41 in	M	M	waist 28 to 30 in	US numeric 8-10
L	waist 30 to 33 in, hip 42 to 45 in	L	L	waist 31 to 33 in	US numeric 12-14
XL	waist 33 to 35 in, hip 45 to 47 in	XL	XL	waist 34 to 36 in	US numeric 16-18
XXL	waist 36 to 39 in, hip 48 to 51 in	XXL	XXL	waist 37 to 40 in	US numeric 20-22

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

Oysho size guide, read on 2026-09-18. Oysho on TrueToSize
SET Active size guide, read on 2026-09-18.

SET Active to Oysho