(1) A loose-fitting jacket for men, often of a heavy fabric and trimmed with braid, worn indoors, esp. as a lounging jacket.

(2) A man's evening jacket, often made of a fine fabric, elaborately trimmed, and usually worn at home.
Hugh Hefner wears a Smokers Jacket. Several hip-hop artists (like Nas) mention wearing this type of jacket in their songs.

http://www.hillesodesigns.com/htdocs/deluxesmoking.htm
by Chiefkyle January 5, 2009
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