I think that a white tee can be your best friend.
Just look at all the different looks you can create with this versatile little item. grunge, classic, girly, flirty, fierce, relaxed. When you have somewhere to go and you feel like you have nothing to wear. My best style advice is to pull out old faithful and accessorize your look, then the rest of your look falls into place.. pants, shoes and bag... hawt.