On formal occasions, an evening suit or tails are worn, but with a white bow tie or white waistcoat to distinguish him from the normal wear of the guests.

• 在正式场合，应穿上晚礼服或者燕尾服，配上白色蝴蝶结或者白色马甲，以便和穿正式礼服的客人区别开来。