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Nike to J.Crew clothing size

The short answer

Nike L is J.Crew 12 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 Nike size read across to J.Crew. Letter sizes on the left, US on the right.
NikeNike builds it forJ.Crew, by chartSame labelJ.Crew builds it forJ.Crew also prints
XXSbust 27.5 to 29.5 in, waist 21.3 to 23.5 in, hip 30.5 to 33 innot madenot publishednot publishednot published
XSbust 29.5 to 32.5 in, waist 23.5 to 26 in, hip 33 to 35.5 in000not publishedbust 31 in, waist 23 inLetter XXXS · UK 0 · DE 24 · FR 28 · IT 32 · AU 0 · JP 1
Sbust 32.5 to 35.5 in, waist 26 to 29 in, hip 35.5 to 38.5 in2not publishedbust 34 in, waist 26 inLetter XS · UK 6 · DE 30 · FR 34 · IT 38 · AU 6 · JP 5
Mbust 35.5 to 38 in, waist 29 to 31.5 in, hip 38.5 to 41 in8not publishedbust 37 in, waist 29 inLetter M · UK 12 · DE 36 · FR 40 · IT 44 · AU 12 · JP 11
Lbust 38 to 41 in, waist 31.5 to 34.5 in, hip 41 to 44 in12not publishedbust 39.5 in, waist 31.5 inLetter L · UK 16 · DE 40 · FR 44 · IT 48 · AU 16 · JP 15
XLbust 41 to 44.5 in, waist 34.5 to 38.5 in, hip 44 to 47 in16not publishedbust 43.5 in, waist 35.5 inLetter XL · UK 20 · DE 44 · FR 48 · IT 52 · AU 20 · JP 19
XXLbust 44.5 to 48.5 in, waist 38.5 to 42.5 in, hip 47 to 50 in18not publishedbust 46 in, waist 38 inLetter XXL / 1X · UK 22 · DE 46 · FR 50 · IT 54 · AU 22 · JP 21
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the J.Crew 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

J.Crew to Nike