Approximate measurements:
S: chest (pit to pit): 20" (51 cm); shoulder to shoulder: 17.5" (44.5 cm); sleeve length: 25.5" (65 cm)
M: chest (pit to pit): 21" (53.5 cm); shoulder to shoulder: 18" (46 cm); sleeve length: 25.5" (65 cm)
L: chest (pit to pit): 22" (56 cm); shoulder to shoulder: 18.5" (47 cm); sleeve length: 26" (66 cm)
XL: chest (pit to pit): 23" (58.5 cm); shoulder to shoulder: 19" (48 cm); sleeve length: 26.5" (67 cm)