Just as an anorak, its origin came from the native peoples of the north. The characteristic is knee length. The fact that we have it in common usage we owe to the military. In the late 50's of the twentieth century was created "fishtail" - the first military parks jacket model.
American engineers used the idea of the German suit for paratroopers - the lower edge is equipped with special latches, so that you can hook the jacket around the legs. After a short time, it began to be willingly bought also by civilians, gaining more and more popularity.
Currently, it is one of the classic models of jackets adapted for use during unfavorable atmospheric conditions manifested by low temperature and strong wind.!