dinner-jacket

Noun

dinner jacket (plural dinner jackets)

1. (US, especially) A jacket, often white, corresponding to a tuxedo jacket.
   • Constant was fully dressed in blue-green evening shorts and a dinner jacket of gold brocade.1959, Kurt Vonnegut, chapter 2, in The Sirens of Titan, New York: Dial, published 2006, page 49
2. (UK) The formal suit, typically black, that includes this type of jacket.
   • [They] sat in a pen in the corner, smoking cigarettes and reading magazines; four or five girls in black silk dresses and the same number of slight effeminate young men in dinner-jackets.1932, Nevil Shute, chapter 2, in Lonely Road

   Synonyms:

   black tie, penguin suit