jerkin n 1: a tight sleeveless and collarless jacket (often made of leather) worn by men in former times
Jerkin \Jer"kin\, n. [Dim. of D. jurk a frock.] A jacket or short coat; a close waistcoat. --Shak. [1913 Webster]
Jerkin \Jer"kin\, n. (Zool.) A male gyrfalcon. [1913 Webster]