This is a U.S. military utility shirt. Regular utility shirts are made of twill, but during the Vietnam War, a small number of these were made from poplin. I think it would be convenient in a climate like Japan's, which is hot and humid. Size: M Actual Size: 76 / 56 / 46 / 59 (Length / Width / Shoulder Width / Sleeve Length) Condition: Shows little wear, and is in good condition overall. Color: Khaki Material: 100% Cotton Country of Origin: MADE IN USA Era: 1960s