Nike to Reiss clothing size

The short answer

Nike M is Reiss 12 by the two brands' own charts.

Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.

Every Nike size read across to Reiss. Letter sizes on the left, UK on the right.
Nike	Nike builds it for	Reiss, by chart	Same label	Reiss builds it for	Reiss also prints
XXS	bust 27.5 to 29.5 in, waist 21.3 to 23.5 in, hip 30.5 to 33 in	not made	not published	not published	not published
XS	bust 29.5 to 32.5 in, waist 23.5 to 26 in, hip 33 to 35.5 in	4	not published	bust 31 in, waist 24 in, hip 34 in	US 0 · Letter XS · FR 34 · IT 36 · AU 4 · EU (as printed) 32
S	bust 32.5 to 35.5 in, waist 26 to 29 in, hip 35.5 to 38.5 in	8 or 10	not published	bust 33 in, waist 26 in, hip 36 in	US 4 · Letter S · FR 38 · IT 40 · AU 8 · EU (as printed) 36
M	bust 35.5 to 38 in, waist 29 to 31.5 in, hip 38.5 to 41 in	12	not published	bust 37 in, waist 30 in, hip 40 in	US 8 · Letter M · FR 42 · IT 44 · AU 12 · EU (as printed) 40
L	bust 38 to 41 in, waist 31.5 to 34.5 in, hip 41 to 44 in	14	not published	bust 39 in, waist 31.5 in, hip 42 in	US 10 · Letter M · FR 44 · IT 46 · AU 14 · EU (as printed) 42
XL	bust 41 to 44.5 in, waist 34.5 to 38.5 in, hip 44 to 47 in	18	not published	bust 43 in, waist 36 in, hip 46.5 in	US 14 · Letter L · FR 48 · IT 50 · AU 18 · EU (as printed) 46
XXL	bust 44.5 to 48.5 in, waist 38.5 to 42.5 in, hip 47 to 50 in	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the Reiss chart. Read from the two charts only; no formula and no averaging.

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.

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Sources

Nike size guide, read on 2026-09-18. Nike on TrueToSize
Reiss size guide, read on 2026-09-18.

Reiss to Nike