fancy dress

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Stern guides have been replaced by volunteers offering fancy-dress outfits or cooking lessons to children.
志愿者为孩子提供化妆舞会的服装或是烹饪课借以取代严格的指导课程。
She was too excited to do any housework that morning, for in the evening she would be going to a fancy-dress party with her husband.
那天上午，她兴奋得什么家务活都不想做，因为晚上她要同丈夫一起参加一个化装舞会。
Guests at a fancy-dress party are familiar with the phenomenon: the one who dresses up as Casanova develops a talent in charming the attendees that is otherwise unknown in him.
在化妆舞会上的人可能很熟悉这样一个场景：打扮成卡萨诺瓦(风流男子的代表)的人能够表现出吸引来宾的魅力，有可能连他本人都不知道自己有这种能力。

At a black-tie event, the men dress in tuxedos or dark suits and the women wear fancy dresses.

The country is not returning to 1977 and its home-made fancy-dress costumes or Coronation bunting dug out of attics.
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When in 1883 Mrs Cornelius Vanderbilt, arrayed for a fancy-dress ball as Electric Light, topped off her satin and diamonds with a large incandescent bulb, it subtracted nothing from the elegance of the scheme.
ECONOMIST: Going out all over Europe, and beyond

the special clothes that you wear for a party where everyone dresses as a particular type of character or thing

Fancy dress is clothing that you wear for a party at which everyone tries to look like a famous person or a person from a story, from history, or from a particular profession.