Reiss to Nike clothing size

The short answer

Reiss 14 is Nike L 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 Reiss size read across to Nike. UK sizes on the left, Letter on the right.
Reiss	Reiss builds it for	Nike, by chart	Same label	Nike builds it for	Nike also prints
4	bust 31 in, waist 24 in, hip 34 in	XS	XS	bust 29.5 to 32.5 in, waist 23.5 to 26 in, hip 33 to 35.5 in	not published
6	bust 32 in, waist 25 in, hip 35 in	XS	XS	bust 29.5 to 32.5 in, waist 23.5 to 26 in, hip 33 to 35.5 in	not published
8	bust 33 in, waist 26 in, hip 36 in	S	S	bust 32.5 to 35.5 in, waist 26 to 29 in, hip 35.5 to 38.5 in	not published
10	bust 35 in, waist 28 in, hip 38 in	S	S	bust 32.5 to 35.5 in, waist 26 to 29 in, hip 35.5 to 38.5 in	not published
12	bust 37 in, waist 30 in, hip 40 in	M	M	bust 35.5 to 38 in, waist 29 to 31.5 in, hip 38.5 to 41 in	not published
14	bust 39 in, waist 31.5 in, hip 42 in	L	M	bust 38 to 41 in, waist 31.5 to 34.5 in, hip 41 to 44 in	not published
16	bust 41 in, waist 33.5 in, hip 44 in	L	L	bust 38 to 41 in, waist 31.5 to 34.5 in, hip 41 to 44 in	not published
18	bust 43 in, waist 36 in, hip 46.5 in	XL	L	bust 41 to 44.5 in, waist 34.5 to 38.5 in, hip 44 to 47 in	not 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, 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

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

Nike to Reiss