ATC General Sizing Guide

 MEN'S SM MED LG XL 2XL 3XL 4XL
Chest 34-36 38-40 42-44 46-48 50-52 54-55 56-57
Waist 29-32 32-35 35-38 38-41 41-44 44-47 47-50
Sleeve Length 32-33.5 34-35 35-36 36-37 37-38 38-39 38.5-39

 LADIES' XS SM MED LG XL 2XL
Bust 32-34 35-36 37-38 39-41 42-44 45-47
Waist 24-25 26-27 28-30 30-32 33-35 36-38
Hip 33-35 35-37 37-39 39-41 42-44 45-47
Sleeve Length 30-30.5 30.5-31 31.5-32 32.5-33 33.5-34 34.5-35
Numeric Size 2 4-6 8-10 12-14 16 18-20