Lucky Brand to Old Navy jeans size

The short answer

Lucky Brand 6 is Old Navy 6 or 8 by the two brands' own charts. 0 of 6 Lucky Brand 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 Lucky Brand size read across to Old Navy. US numeric sizes on the left, US numeric on the right.
Lucky Brand	Lucky Brand builds it for	Old Navy, by chart	Same label	Old Navy builds it for	Old Navy also prints
0	waist 25.5 in, hip 36 in	0 or 2	00	waist 25 in, hip 35.5 in	Letter XS
2	waist 26.5 in, hip 37 in	2 or 4	2	waist 26 in, hip 36.5 in	Letter XS
4	waist 27.5 in, hip 38 in	4 or 6	4	waist 27 in, hip 37.5 in	Letter S
6	waist 28.5 in, hip 39 in	6 or 8	6	waist 28 in, hip 38.5 in	Letter S
8	waist 29.5 in, hip 40 in	8 or 10	8	waist 29 in, hip 39.5 in	Letter M
10	waist 30.5 in, hip 41 in	10	10	waist 30 in, hip 40.5 in	Letter M

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

Lucky Brand size guide, read on 2026-09-18.
Old Navy size guide, read on 2026-09-17. Old Navy on TrueToSize

Old Navy to Lucky Brand