One of my favorite looks is the classic combo:  black and white.  It's simple, smart, and can be dressed up or down.  Pair a simple white bodysuit or tank with a black blazer to achieve this look.  Add a pair of dark skinny jeans to complete the outfit.  It's so easy, and I feel like most of us already have a white shirt and black blazer in our wardrobe.  Add some heels and red lipstick and you're all set for a holiday party.  What's more pulled together and elegant than black and white? You just can't go wrong.  It wins every time in my book. 

White bodysuit:

http://store.americanapparel.net/product/index.jsp?productId=rsa8357&key=productfeed&productId=rsa8357&ci_src=17588969&ci_sku=94253&mpch=ads

Black blazer:

http://oldnavy.gap.com/browse/product.do?vid=1&pid=602507012