Cosby sweater
n.— «Both men are wearing garish, multicolored cable-knit sweaters, known in pop culture parlance as “Cosby sweaters”— so named for the famous comedian and his eponymous 1980s sitcom.» —“The Cosby Effect” by Mike Seely Seattle Weekly (Washington) Dec. 13, 2006. (source: Double-Tongued Dictionary)
Further reading
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