Navy military vest with alpaca lining.
This item is actually a mystery as there is no label indicating its military status.
It is certain that it was at least used as military equipment, as there are photographs of it being worn and issued to Navy and Marine Corps soldiers.

・Material: Cotton poplin
・Lining: Alpaca wool hair
・Front zipper: 40s bell type, brass, cotton ribbon
・Sewing thread: Catan thread (cotton thread)

Made in Japan