Question

dress up

Accepted Answer

to put
  on fancy-dress: He dressed up as a pirate for the party.2 to dress in formal,
  not casual, clothes: Don't dress up speacially for the party - just come as
  you are. 3 to make (something) appear better, more pleasant etc than it is by
  adding to it etc: We dressed it up when we told him, of course, but the plain
  fact is that he's useless. You can dress that blouse up with a necklace.

Dress Dressed Put Fancy Dress Pirate Party.2 Formal Casual