The Collaborative International Dictionary
Polka jacket
Polka \Pol"ka\, n. [Pol. Polka a Polish woman: cf. F. & G. polka.]
A dance of Polish origin, but now common everywhere. It is performed by two persons in common time.
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(Mus.) A lively Bohemian or Polish dance tune in 2-4 measure, with the third quaver accented.
Polka jacket, a kind of knit jacket worn by women.
Wiktionary
polka jacket
n. A kind of knitted jacket for woman.