The first nylon flight jacket, which was delivered in large numbers to pilots, was developed between 1942 and 1945 and introduced in 1947: the "Type B-15B". The earlier versions "B-15" and "B-15A" (1944) were still made of fabric. Later there were still the versions C and D. The cut and all military specifications were developed by Dobbs Industries together with the US - Department of Defense. An alternative to the expensive leather and fabric jackets was sought, which was just as robust and warming.