If anything can add some quick professionalism to your outfit in a pinch, it’s a blazer. (As my friend at work says: I can wear a T-shirt under this and still look good. I may be paraphrasing.)
Let’s go shopping in my fantasy closet, courtesy of Polyvore:
So many colors! And so many ways to play with your look. Throw it on in the office, and take it with you when you go out and things get a little chilly.
One blazer can work as a statement piece to tie all these things together. I put business on the left and play on the right—but, really, you could mix and match any of these items and be good to go.
My advice? Invest in one you love, and keep it handy!