niall size chart

model is 5'9" and wearing a size small

xs: chest: 40.75 in; length: 22 in
s: chest: 42.75 in; length: 22.5 in
m: chest: 44.75 in; length: 23 in
l: chest: 46.75 in; length: 23.5 in
xl: chest 48.75 in; length: 25 in