What type of clothing is a jerkin?

Answer 1

According to the American Heritage Dictionary of the English Language, here's the definition of a jerkin:

-- 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 16th century;

-- a short, close-fitting, often sleeveless coat or jacket, usually of leather.

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Answer 2

Sleeveless mens' jackets (from the 16th century), usually made of leather.