fancy dress
US
UK fancy dress n: US (formal or evening clothes) (舞会等穿的)
SC 晚装 wǎn zhuāng
The invitation states we should wear fancy dress, so I'll need to buy a new suit.
邀请函写道我们要穿晚装出席，所以我需要买新套装。
fancy dress n: UK (costume, disguise) (化妆舞会上扮演动物或其他人物的)
SC 化妆服
Marco turned up to the party in a Superman outfit, because he thought he was supposed to wear fancy dress.
因为他认为应该要着化妆服，所以马尔科穿着一套超人装现身派对现场。