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A man's evening jacket, often made of a fine fabric, elaborately trimmed, and usually worn at home.
(Clothing & Fashion) a man's comfortable jacket of velvet, etc, closed by a tie belt or fastenings, worn at home
[so called because it was formerly worn for smoking]
a loose-fitting jacket for men, often of a heavy fabric and trimmed with braid, worn indoors, esp. for lounging.