This vintage suit jacket was made in the early 1940s by Capps Clothes (established 1838) and was sold by Jacoby’s Store for Men, Helena, Montana. Jacoby’s changed their name from Bossler’s in 1941, so with the 1939 union tag, the high cut, pre-bold look of the suit and the information about the original store, I would put this jacket’s original date of manufacture from 1941-1944.
Chest (pit to pit): 21″ (doubled = 42″)
Shoulder to shoulder: 16″
Sleeve (Shoulder to cuff): 24-1/2″
Length (Base of collar to hem): 29-1/2″