This vintage shirt was made in the 1940s. it has two chest pockets one with a pencil pocket, double button cuffs and epaulettes. It has a chinstrap collar stand, a detail common on workshirts of the 1920s-1930s. The maker of this shirt likely was primarily a maker of those workshirts before being awarded the contract to make this one for the Army.
Chest (pit to pit): 20″ (doubled = 40″)
Shoulder to shoulder: 17″
Sleeve (shoulder to cuff): 24″
Length (Base of collar to hem): 31″