Form or Function?

Well NYC fall/winter is here.  That means it's time to retire the lightweight jackets and capris and move into warmer clothes like sweaters and jackets.  Now here is a dilemma, do you wear a cute jacket that provides no protection against the elements or a bulky jacket that is designed for subzero temps?  Me personally, I'm all about the North Face.  I hate being cold and this is the best thing I've ever bought in my 10+ years in NY.  Whats your take on this?