Wearing formal (dress) clothes. / Wearing a costume.

simple past tense and past participle of dress up

(intransitive) To put on special or fancy clothes. / (intransitive, often with 'as') To put on a costume portraying oneself as a particular type of character or well-known person.

Third-person singular simple present indicative form of dress up

present participle of dress up

(informal) A child's game of putting on different clothes and pretending to be different people.

costume party

plural of dress-up party

plural of dress-up game

(video games) A simple form of video game in which the player can dress a character in various different clothing.