This jacket was made in the USA by Avirex Ltd. based upon the 1940s M-421a cotton flight jacket. It has the distinctive diamond shaped reinforcements on the sleeves, belt back and patch pockets.  The unbranded bell shaped zipper is a decent approximation of the original, which wouldn’t be fully reproduced for years after the production run of this jacket. The jacket is, like the original, unlined, with an inside pocket.

Chest (pit to pit): 24″ (doubled = 48″)

Shoulder to shoulder: 20″

Sleeve (shoulder to cuff): 21-1/2″

Length (base of collar to hem): 25-1/4″