Model is 5'9" tall, weighs 155 lb and is wearing a size Medium

SIZE CHEST SHOUDLER SLEEVE LENGTH
SMALL 20" 16.5" 25.75" 24.75"
MEDIUM 21" 17" 26" 25.25"
LARGE 22" 17.5" 26" 26"
X-LARGE 23" 18" 26.5" 26.5"

*Measurement taken from Rogue Territory's official website*