To dress up

to dress elaborately, artificially, or pompously.

See also: Dress

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Grown-ups, on the other hand, sometimes like to dress up as nurses or schoolgirls.
(J) goes to dress ups closet and hides his eyes while (D) hides the rocks in the dress ups.