WordNet (r) 3.0 (2006):

fancy up
    v 1: put on special clothes to appear particularly appealing and
         attractive; "She never dresses up, even when she goes to
         the opera"; "The young girls were all fancied up for the
         party" [syn: overdress, dress up, fig out, fig up,
         deck up, gussy up, fancy up, trick up, deck out,
         trick out, prink, attire, get up, rig out, tog
         up, tog out] [ant: dress down, underdress]