Oysho to Gymshark leggings size

The short answer

Oysho S is Gymshark XS by the two brands' own charts. 2 of 7 Oysho sizes land on a different label at Gymshark.

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 Gymshark. Letter sizes on the left, Letter on the right.
Oysho	Oysho builds it for	Gymshark, by chart	Same label	Gymshark builds it for	Gymshark also prints
XXS	waist 24 to 25 in, hip 36 to 37 in	XXS	XXS	waist 24 in, hip 35.5 in	US numeric 2-4
XS	waist 25 to 26 in, hip 37 to 38 in	XS	XS	waist 26 in, hip 37.5 in	US numeric 4-6
S	waist 26 to 27 in, hip 38 to 39 in	XS	S	waist 26 in, hip 37.5 in	US numeric 4-6
M	waist 27 to 29 in, hip 39 to 41 in	S	M	waist 28 in, hip 39.5 in	US numeric 6-8
L	waist 30 to 33 in, hip 42 to 45 in	L	L	waist 32 in, hip 43.5 in	US numeric 10-12
XL	waist 33 to 35 in, hip 45 to 47 in	XL	XL	waist 34 in, hip 45.5 in	US numeric 12-14
XXL	waist 36 to 39 in, hip 48 to 51 in	XXL	XXL	waist 36 in, hip 47.7 in	US numeric 14-16

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.

Open in the converter Add an item you own

Sources

Oysho size guide, read on 2026-09-18. Oysho on TrueToSize
Gymshark size guide, read on 2026-09-17. Gymshark on TrueToSize

Gymshark to Oysho