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NYDJ to Old Navy jeans size

The short answer

NYDJ 00 is Old Navy 0 or 2 by the two brands' own charts. 8 of 11 NYDJ sizes land on a different label at Old Navy.

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

Every NYDJ size read across to Old Navy. US numeric sizes on the left, US numeric on the right.
NYDJNYDJ builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
00waist 25 to 26 in, hip 35 to 36 in0 or 200waist 25 in, hip 35.5 inLetter XS
00waist 25 to 26 in, hip 35 to 36 in0 or 200waist 25 in, hip 35.5 inLetter XS
2waist 27 to 28 in, hip 37 to 38 in4 or 62waist 27 in, hip 37.5 inLetter S
4waist 28 to 29 in, hip 38 to 39 in6 or 84waist 28 in, hip 38.5 inLetter S
6waist 29 to 30 in, hip 39 to 40 in8 or 106waist 29 in, hip 39.5 inLetter M
8waist 30 to 31 in, hip 40 to 41 in108waist 30 in, hip 40.5 inLetter M
10waist 31 to 32.5 in, hip 41 to 42.5 in1210waist 31.5 in, hip 42 inLetter L
12waist 32.5 to 34 in, hip 42.5 to 44 in1412waist 33.5 in, hip 44 inLetter L
14waist 34 to 35.5 in, hip 44 to 45.5 in14 or 1614waist 33.5 in, hip 44 inLetter L
16waist 35.5 to 37 in, hip 45.5 to 47 in1616waist 36.3 in, hip 46.5 inLetter XL
18waist 37 to 38.5 in, hip 47 to 48.5 in18 or 1618waist 39 in, hip 49 inLetter XL
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. 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

Old Navy to NYDJ