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Uniqlo to J.Crew clothing size

The short answer

Uniqlo L is J.Crew 4 or 2 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 Uniqlo Japan sizing size read across to J.Crew. Letter sizes on the left, US on the right.
Uniqlo Japan sizingUniqlo builds it forJ.Crew, by chartSame labelJ.Crew builds it forJ.Crew also prints
XSbust 28.7 to 31.1 in, waist 22.4 to 24.8 in, hip 31.5 to 33.9 in000not publishedbust 31 in, waist 23 inLetter XXXS · UK 0 · DE 24 · FR 28 · IT 32 · AU 0 · JP 1
Sbust 30.3 to 32.7 in, waist 24 to 26.4 in, hip 33.1 to 35.4 in000 or 00not publishedbust 31 in, waist 23 inLetter XXXS · UK 0 · DE 24 · FR 28 · IT 32 · AU 0 · JP 1
Mbust 31.9 to 34.3 in, waist 25.6 to 28 in, hip 34.7 to 37 in0not publishedbust 33 in, waist 25 inLetter XS · UK 4 · DE 28 · FR 32 · IT 36 · AU 4 · JP 3
Lbust 33.5 to 35.8 in, waist 27.2 to 29.5 in, hip 36.2 to 38.6 in4 or 2not publishedbust 35 in, waist 27 inLetter S · UK 8 · DE 34 · FR 36 · IT 40 · AU 8 · JP 7
XLbust 35.8 to 38.2 in, waist 29.5 to 31.9 in, hip 38.6 to 40.9 in8not publishedbust 37 in, waist 29 inLetter M · UK 12 · DE 36 · FR 40 · IT 44 · AU 12 · JP 11
XXLbust 38.2 to 40.6 in, waist 31.9 to 34.3 in, hip 40.9 to 43.3 in12not publishedbust 39.5 in, waist 31.5 inLetter L · UK 16 · DE 40 · FR 44 · IT 48 · AU 16 · JP 15
3XLbust 40.6 to 42.9 in, waist 34.3 to 36.6 in, hip 43.3 to 45.7 in14not publishedbust 41 in, waist 33 inLetter L · UK 18 · DE 42 · FR 46 · IT 50 · AU 18 · JP 17
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

J.Crew to Uniqlo