This vintage mackinaw coat was made in the 1930s.  It has a caped front, double layer back and trimmed adjusters on the cuffs.  .

Chest (pit to pit): 22″ (doubled = 44″)

Shoulder to shoulder: 17-1/2″

Sleeve (shoulder to cuff): 22-1/2″

Length (base of collar to hem): 27-1/2″