WordNet (r) 3.0 (2006):

pretty up
    v 1: use special care in dressing, making-up, etc.; "She dolled
         herself up for the night out with her friends" [syn: doll
         up, do up, pretty up, glam up]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "pretty up":
   adorn, beautify, become one, bedizen, deck out, decorate, dizen,
   doll up, dress up, fancy up, fig out, get up, glamorize, grace,
   gussy up, overdress, prank, prettify, primp, prink, rag out,
   set off, slick up, spruce up, titivate, trick out, trick up