燕尾服是WHITE TIE, 非常FORMAL(正式)的场合 BLACK TIE指的是SEMI-FORMAL(半正式),像学校一年一度的晚宴啦,都属这种, 普通的EVENING JACKET加领带就可以了..即传统的西装领带之类的…A “formal” or white tie dress code typically means tail-coats for men and full-length evening dresses for women. “Semi-formal” has a much less precise definition but typically means an evening jacket and tie for men (known as black tie) and a dress for women. “Business casual” typically means not…