They held a fancy dress ball.

他们举行了一次化装舞会。

youdao

Someone organises a fancy dress party: you fork out on an expensive costume.

有人组织化妆舞会，你就下血本去买很贵的服装；

youdao

Children take part in a fancy dress contest to mark the birth of Lord Krishna, at a school in mumbai.

孟买一所学校，孩子们参加纪念克利须那神诞辰的化装比赛。

youdao

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

VOA: special.2009.12.28

We also had a fancy dress event after our game with Batley.

BBC: Andrew Henderson column

Shop assistant Miss Manning had been to a fancy dress party and a nightclub with Mr White when she walked off alone in the early hours of 10 December.

BBC: Jury fails to reach verdict in Rachel Manning murder trial

Miss Manning, a shop assistant, had been to a 70s fancy dress party and a nightclub with her boyfriend Barri White.

BBC: Rachel Manning