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。

Ma: They didn't mention that, but since it is a very formal occasion, it is quite usual for ladies to wear evening dresses or banquet dresses.

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我们这儿参加晚宴不穿礼服。

We don't dress for dinner here.

《柯林斯英汉双解大词典》

晚宴后，在阁楼上，芭芭拉给安妮拿出了一件老式的结婚礼服。

In the attic after dinner. Barbara shows Annie an old fashioned wedding dress.

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