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Athleta to Sandro clothing size

The short answer

Athleta S 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 Athleta size read across to Sandro. Letter sizes on the left, FR on the right.
AthletaAthleta builds it forSandro, by chartSame labelSandro builds it forSandro also prints
XXSbust 31.5 in, waist 24.3 in, hip 34 in34not publishedbust 32 in, waist 25 in, hip 35 inUS 2 · Letter XS · UK 6 · DE 32 · IT 38
XSbust 32.5 to 33.5 in, waist 25.3 to 26.3 in, hip 35 to 36 in34 or 36not publishedbust 32 in, waist 25 in, hip 35 inUS 2 · Letter XS · UK 6 · DE 32 · IT 38
Sbust 34.5 to 35.5 in, waist 27.3 to 28.3 in, hip 37 to 38 in38not publishedbust 35 in, waist 28 in, hip 38 inUS 6 · Letter M · UK 10 · DE 36 · IT 42
Mbust 36.5 to 37.5 in, waist 29.3 to 30.3 in, hip 39 to 40 in40not publishedbust 37 in, waist 30 in, hip 39 inUS 8 · Letter L · UK 12 · DE 38 · IT 44
Lbust 39 to 40.5 in, waist 31.8 to 33.3 in, hip 41.5 to 43 in42not publishedbust 39 in, waist 31 in, hip 41 inUS 10 · Letter XL · UK 14 · DE 40 · IT 46
XLbust 42 in, waist 34.3 in, hip 44.5 innot madenot publishednot publishednot published
1Xbust 44.3 to 46.3 in, waist 38 to 40 in, hip 47.3 to 49.3 innot madenot publishednot publishednot published
2Xbust 48.3 to 50.8 in, waist 42 to 44.5 in, hip 51.3 to 53.8 innot madenot publishednot publishednot published
3Xbust 53.3 to 55.8 in, waist 47 to 49.5 in, hip 56.3 to 58.8 innot madenot publishednot publishednot 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

Sandro to Athleta