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bumfreezer

British  
/ ˈbʌmˌfriːzə /

noun

  1. a slang name for an Eton jacket

  2. slang any of various similar styles of short jacket worn by men

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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The clothes seldom vary much — jeans, jeans jackets, khakis, bumfreezer blazers — and, according to the mood of the twin designers Dean and Dan Caten, are either laboriously distressed or ostentatiously schoolboy proper.

From New York Times