A coarse frock or loose upper garment formerly worn by Jews; a mean dress.

See Gabardine.

Gaberdines or gabardines were originally a long, loose coat or frock for men worn in the Middle Ages, especially by Jews. In modern usage gaberdin overcoats were commonly worn by men and boys. Many British private schools perscribed a particular style of gaberdine raincoat to be worn over their school uniform.

a loose coverall (coat or frock) reaching down to the ankles

a coarse long loose outer garment worn in medieval times and especially by Jews since the 16th century; an English laborer's smock