dress up

Short definition from Wiktionary

Verb

1. 1
   To put on special or fancy clothes.
2. 2
   To put on a costume portraying oneself as a particular type of character or well-known person.
3. 3
   To put a costume on (someone) portraying them as a particular type of character or well-known person.
4. 4
   To decorate; to prettify.
5. 5
   To present in a favorable light.

Noun

1. 1
   A child's game of putting on different clothes and pretending to be different people.