closet full of clothes with nothing to wear

I have fallen prey to the age old problem that has plagued women for years; a closet full of clothes, but nothing to wear.  On a day to day basis, I have an adequate amount of clothing, it's the "going out" clothes I'm having an issue with.  For the past few weekends, getting dressed up for a night on the town has been a serious challenge.  While I'm not short on basics, I am in desperate need of pieces that will make my outfits pop.  Last Saturday, I sported a cream sundress and a navy cardigan, both courtesy of J. Crew.  While this outfit was stylish enough, I looked more fit for chapter meeting or even church (gasp!).  For a fun night out, I need some more edge.  That being said, I don't want to look scandalous either.  Finding the perfect blend of classy and sexy is my latest fashion challenge.  Suggestions?