Lululemon to Oysho leggings size

The short answer

lululemon 4 is Oysho XXS by the two brands' own charts.

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

Every lululemon size read across to Oysho. US numeric sizes on the left, Letter on the right.
lululemon	lululemon builds it for	Oysho, by chart	Same label	Oysho builds it for	Oysho also prints
0	waist 21 in, hip 32 in	not made	not published	not published	not published
2	waist 23 in, hip 33 in	not made	XXS	not published	not published
4	waist 25 in, hip 35 in	XXS	XS	waist 24 to 25 in, hip 36 to 37 in	not published
6	waist 27 in, hip 37 in	S	S	waist 26 to 27 in, hip 38 to 39 in	not published
8	waist 29 in, hip 39 in	M	M	waist 27 to 29 in, hip 39 to 41 in	not published
10	waist 31 in, hip 41 in	L	L	waist 30 to 33 in, hip 42 to 45 in	not published
12	waist 33 in, hip 43 in	XL	XL	waist 33 to 35 in, hip 45 to 47 in	not published
14	waist 35 in, hip 45 in	XL	XXL	waist 33 to 35 in, hip 45 to 47 in	not published
16	waist 38 in, hip 47 in	XXL	not published	waist 36 to 39 in, hip 48 to 51 in	not published
18	waist 41 in, hip 49 in	not made	not published	not published	not published
20	waist 43 in, hip 51 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 Oysho 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

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

Oysho to lululemon