Passengers must wear their best attire, including formalevening suits and dresses.
旅客必须穿上最好的衣服，包括正式的晚礼服。
2
Ma: They didn't mention that, but since it is a very formal occasion, it is quite usual for ladies to wearevening dresses or banquet dresses.
马：他们没有提及，但由于这是个很正式的晚宴，女士通常要穿晚礼服或晚宴礼服。
3
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.