dress up

verb

to put on or wear formal or fancy clothes, to decorate, wearing formal clothes/adornments

To put on special or fancy clothes.
“Everyone dressed up for the graduation ball.”
“I want a job where I don't have to dress up.”
To put on a costume portraying oneself as a particular type of character or well-known person.
“We're having a party on Saturday, but you must dress up as a famous historical figure.”
To put a costume on (someone) portraying them as a particular type of character or well-known person.
“The cat hated when they dressed him up for Halloween.”
To decorate; to prettify.
“Mistress, your father prays you leave your books, And help to dress your sister’s chamber up: You know to-morrow is the wedding-day.”
To present in a favorable light.
“You can dress up that proposal however you want; it's still going to go over like a lead balloon.”