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Gap to NYDJ jeans size

The short answer

Gap 2 is NYDJ 0 by the two brands' own charts. 8 of 9 Gap sizes land on a different label at NYDJ.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every Gap size read across to NYDJ. US numeric sizes on the left, US numeric on the right.
GapGap builds it forNYDJ, by chartSame labelNYDJ builds it forNYDJ also prints
000waist 24 in, hip 33.3 innot made00not publishednot published
000waist 24 in, hip 33.3 innot made00not publishednot published
000waist 24 in, hip 33.3 innot made00not publishednot published
2waist 26.5 in, hip 36.3 in02waist 26 to 27 in, hip 36 to 37 inWaist size 26 · Letter XS
4waist 27.5 in, hip 37.3 in24waist 27 to 28 in, hip 37 to 38 inWaist size 27 · Letter XS
6waist 28.5 in, hip 38.3 in46waist 28 to 29 in, hip 38 to 39 inWaist size 28 · Letter S
8waist 29.5 in, hip 39.3 in68waist 29 to 30 in, hip 39 to 40 inWaist size 29 · Letter S
10waist 30.5 in, hip 40.3 in810waist 30 to 31 in, hip 40 to 41 inWaist size 30 · Letter M
12waist 32 in, hip 41.8 in1012waist 31 to 32.5 in, hip 41 to 42.5 inWaist size 31 · Letter M
14waist 33.5 in, hip 43.3 in1214waist 32.5 to 34 in, hip 42.5 to 44 inWaist size 32 · Letter L
16waist 35.5 in, hip 45.3 in1416waist 34 to 35.5 in, hip 44 to 45.5 inWaist size 33 · Letter L
18waist 37.5 in, hip 47.3 in1818waist 37 to 38.5 in, hip 47 to 48.5 inLetter XL
20waist 39.5 in, hip 49.3 innot madenot publishednot publishednot published
22waist 41.5 in, hip 51.3 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 5 sizes have no counterpart on the NYDJ chart. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

NYDJ to Gap