男用無袖短上衣,短上衣
Jerkin \Jer"kin\, n. [Dim. of D. jurk a frock.] A jacket or short coat; a close waistcoat. --Shak. Jerkin \Jer"kin\, n. (Zo["o]l.) A male gyrfalcon.
jerkin n : a tight sleeveless and collarless jacket (often made of leather) worn by men in former times