Youth Sizes:

S - 6/8 = 35" Chest/Body Width, 23" Length
M - 10/12 = 37" Chest/Body Width, 25" Length
L - 14/16 = 40" Chest/Body Width, 26.5" Length

Adult Unisex Sizes:

S = 40" Chest/Body Width, 28" Length
M = 44" Chest/Body Width, 29" Length
L = 48" Chest/Body Width, 30" Length
XL = 52" Chest/Body Width, 31" Length
XXL = 56" Chest/Body Width, 32" Length
XXXL = 60" Chest/Body Width, 33" Length