Sandro to Arc'teryx clothing size

The short answer

Sandro 36 is Arc'teryx XS or S 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 Sandro size read across to Arc'teryx. FR sizes on the left, Letter on the right.
Sandro	Sandro builds it for	Arc'teryx, by chart	Same label	Arc'teryx builds it for	Arc'teryx also prints
34	bust 32 in, waist 25 in, hip 35 in	not made	XS	not published	not published
36	bust 34 in, waist 27 in, hip 36 in	XS or S	S	bust 33.1 in, waist 26.8 in, hip 36.2 in	not published
38	bust 35 in, waist 28 in, hip 38 in	S	M	bust 35 in, waist 28.7 in, hip 38.2 in	not published
40	bust 37 in, waist 30 in, hip 39 in	M	L	bust 37 in, waist 30.7 in, hip 40.2 in	not published
42	bust 39 in, waist 31 in, hip 41 in	L or M	XL	bust 40.2 in, waist 33.9 in, hip 43.3 in	not published

Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Arc'teryx 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

Sandro size guide, read on 2026-09-18.
Arc'teryx size guide, read on 2026-09-18.

Arc'teryx to Sandro