名詞 jerkin:

1. a tight sleeveless and collarless jacket (often made of leather) worn by men in former times

jer.kin

n.（名詞）
A close-fitting, hip-length, collarless jacket having no sleeves but often extended shoulders, belted and worn over a doublet by men especially in the 'th century.
短緊身上衣：一種緊身齊臀無領(lǐng)無袖但延伸到兩肩的上衣，尤其指'世紀男子穿著在緊身衣外的束腰帶的上衣
A short, close-fitting, often sleeveless coat or jacket, usually of leather.
皮馬甲：一種短的緊身的無袖上衣或夾克衫，通常是皮制的

來源：
[Origin unknown]
[來源不明]