This Type B-10 flight jacket is reproduced by "Buzz Rickson's", based on the vintage jacket of "Rough Wear Clothing Co.". The Type B-10 is a fabric flight jacket adopted by the U.S. Army Air Forces in July 1943 as a replacement for leather flight jackets. It was designed for use in moderate temperatures ranging from +10｡C to -10｡C. During World War II, the U.S. military faced a severe leather shortage and reevaluated the sewing aspect and productivity, leading to the development of a flight jacket using mass-producible cotton twill fabric. The jacket featured an alpaca mohair wool pile lining, which was less bulky and lightweight compared to sheepskin while providing excellent insulation. In terms of appearance, the U.S. Army and U.S. Navy jointly developed the "AN" series, including AN6552 and AN-J-3A, for general-purpose use. However, the U.S. Army Air Forces did not fully adopt these models, and instead, they incorporated the design into the new cloth flight jacket, the B-10. Material: Water Resistant Cloth 80/3 Ply Combed Cotton Twill (100％ Cotton) Lining: Alpaca ＆ Wool Pile (50％ Wool / 50％ Alpaca) Collar：1/2 Inch Shearling Sheep Mouton Front Fastener: CONMATIC Mil Specs Brass Button: Mil Specs Urea Snap Button: Mil Specs Brass Label: Rough Wear Clothing Co We find that as Buzz Rickson’s is made to an original spec, the brand is small compared to modern fits; therefore we advise customers to try at least a size larger than their standard size. We recommend that you contact our stores so our helpful retail teams can offer advice and give exact sizing information before you purchase. Buzz Rickson's B-10 Roughwear Jacket - Olive Drab