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"In our gloriously dressed past, the lives of many men included a variety of events to which black tie and white tie were worn. Through most of the past century, formal did indeed refer to white tie and tails, and semiformal did indeed refer to dinner clothes, tudos, and other forms of black tie. Now, alas and totally alack, formal is generally taken to mean tux, and semiformal is taken to mean dark suit and (hopefully) tie. So you are both right, in a sense, although your fianc\u00E9e is correct in the best of all possible worlds."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.gq.com/story/black-tie-semiformal>