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NYDJ to Reformation jeans size

The short answer

NYDJ 8 is Reformation 29 by the two brands' own charts.

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

On 2 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

Every NYDJ size read across to Reformation. US numeric sizes on the left, Waist size on the right.
NYDJNYDJ builds it forReformation, by chartSame labelReformation builds it forReformation also prints
00waist 25 to 26 in, hip 35 to 36 in2525waist 25.5 in, hip 36 innot published
00waist 25 to 26 in, hip 35 to 36 in2525waist 25.5 in, hip 36 innot published
2waist 27 to 28 in, hip 37 to 38 in2727waist 27.5 in, hip 38 innot published
4waist 28 to 29 in, hip 38 to 39 in2828waist 28.5 in, hip 39 innot published
6waist 29 to 30 in, hip 39 to 40 in2929waist 30 in, hip 40.5 innot published
8waist 30 to 31 in, hip 40 to 41 in2930waist 30 in, hip 40.5 innot published
10waist 31 to 32.5 in, hip 41 to 42.5 in3031waist 31.5 in, hip 42 innot published
12waist 32.5 to 34 in, hip 42.5 to 44 in3132waist 33.3 in, hip 43.8 innot published
14waist 34 to 35.5 in, hip 44 to 45.5 in3133waist 33.3 in, hip 43.8 innot published
16waist 35.5 to 37 in, hip 45.5 to 47 in32 or 3134waist 38.5 in, hip 49 innot published
18waist 37 to 38.5 in, hip 47 to 48.5 in32not publishedwaist 38.5 in, hip 49 innot published
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

Reformation to NYDJ