Womens's 

XS=  US 0 UK 4

S = US 2 UK 6

M = US 4 UK 10

L =US 6 UK 12

XL =US 8 UK 14

2XL - US 10 UK 16

Most styles are fitted, DM help@anyoldiron.us for spec sheets and sizes in inches

Mens 

XS 36

S 38

M 40

L 42

XL 44

2XL 46