Sandro to J.Crew clothing size

The short answer

Sandro 34 is J.Crew 00 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.

On 1 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

Every Sandro size read across to J.Crew. FR sizes on the left, US on the right.
Sandro	Sandro builds it for	J.Crew, by chart	Same label	J.Crew builds it for	J.Crew also prints
34	bust 32 in, waist 25 in, hip 35 in	00	2	bust 32 in, waist 24 in	Letter XXS · UK 2 · DE 26 · FR 30 · IT 34 · AU 2 · JP 1
36	bust 34 in, waist 27 in, hip 36 in	2	4	bust 34 in, waist 26 in	Letter XS · UK 6 · DE 30 · FR 34 · IT 38 · AU 6 · JP 5
38	bust 35 in, waist 28 in, hip 38 in	4	6	bust 35 in, waist 27 in	Letter S · UK 8 · DE 34 · FR 36 · IT 40 · AU 8 · JP 7
40	bust 37 in, waist 30 in, hip 39 in	8	8	bust 37 in, waist 29 in	Letter M · UK 12 · DE 36 · FR 40 · IT 44 · AU 12 · JP 11
42	bust 39 in, waist 31 in, hip 41 in	12	10	bust 39.5 in, waist 31.5 in	Letter L · UK 16 · DE 40 · FR 44 · IT 48 · AU 16 · JP 15

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, 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.
J.Crew size guide, read on 2026-09-18.

J.Crew to Sandro