Old Navy to Lacoste size
The short answer
Old Navy XS is Lacoste S by the two brands' own charts. 8 of 8 Old Navy sizes land on a different label at Lacoste.
Both brands publish the body chest each size is cut for, so every row matches a chest, not a letter.
On 1 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.
| Old Navy | Old Navy builds it for | Lacoste, by chart | Same label | Lacoste builds it for | Lacoste also prints |
|---|---|---|---|---|---|
| XS | chest 36 to 37 in, neck 13 to 13.5 in, sleeve 31.5 to 32 in | S | XS | chest 35 to 37 in, waist 30 to 31 in | not published |
| S | chest 38 to 39 in, neck 14 to 14.5 in, sleeve 32.5 to 33 in | M | S | chest 38 to 40 in, waist 33 to 35 in | not published |
| M | chest 40 to 42 in, neck 15 to 15.5 in, sleeve 33.5 to 34 in | L | M | chest 41 to 43 in, waist 36 to 38 in | not published |
| L | chest 44 to 46 in, neck 16 to 16.5 in, sleeve 34.5 to 35 in | XL | L | chest 44 to 46 in, waist 39 to 42 in | not published |
| XL | chest 48 to 50 in, neck 17 to 17.5 in, sleeve 35.5 to 36 in | 2XL | XL | chest 48 to 49 in, waist 44 to 46 in | not published |
| XXL | chest 51 to 53 in, neck 18 to 18.5 in, sleeve 36.5 to 37 in | 3XL or 4X | 2XL | chest 51 in, waist 48 in | not published |
| XXXL | chest 55 to 57 in, neck 19 to 19.5 in, sleeve 37.5 to 38 in | 1XG or 2XG | 3XL | chest 55 in, waist 52 in | not published |
| XXXXL | chest 58 to 60 in, neck 20.5 to 21 in, sleeve 38.5 to 39 in | 2XG | not published | chest 57 in, waist 54 in | not published |
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.
Sources
- Old Navy size guide, read on 2026-09-18. Old Navy on TrueToSize
- Lacoste size guide, read on 2026-09-18.