fancy dress
US /ˌfæn.si ˈdres/
UK /ˌfæn.si ˈdres/

1.
fantasia, traje a rigor
clothes worn for a party where everyone dresses as a particular type of character or thing
:
•
She wore a fairy costume to the fancy dress party.
Ela usou uma fantasia de fada na festa a fantasia.
•
The theme of the party is fancy dress from the 80s.
O tema da festa é fantasia dos anos 80.