Lululemon to Sandro clothing size

The short answer

lululemon M is Sandro 38 by the two brands' own charts.

Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.

Every lululemon size read across to Sandro. Letter sizes on the left, FR on the right.
lululemon	lululemon builds it for	Sandro, by chart	Same label	Sandro builds it for	Sandro also prints
XXXS	bust 28.5 in	not made	not published	not published	not published
XXS	bust 30 in	not made	not published	not published	not published
XS	bust 31 to 32 in	34	not published	bust 32 in, waist 25 in, hip 35 in	US 2 · Letter XS · UK 6 · DE 32 · IT 38
S	bust 33 to 34 in	36	not published	bust 34 in, waist 27 in, hip 36 in	US 4 · Letter S · UK 8 · DE 34 · IT 40
M	bust 35 to 36 in	38	not published	bust 35 in, waist 28 in, hip 38 in	US 6 · Letter M · UK 10 · DE 36 · IT 42
L	bust 37 to 38.5 in	40 or 42	not published	bust 37 in, waist 30 in, hip 39 in	US 8 · Letter L · UK 12 · DE 38 · IT 44
XL	bust 40 to 42 in	42	not published	bust 39 in, waist 31 in, hip 41 in	US 10 · Letter XL · UK 14 · DE 40 · IT 46
1X	bust 45 to 47 in	not made	not published	not published	not published
2X	bust 49 to 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 Sandro chart. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.

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Sources

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

Sandro to lululemon