You've got more good decisions to make: Two or three buttons? They both look good, but please, gentleman, do not button the top button of a three-button coat. Two-button coats have a longer lapel and can make a shorter man look taller. A three-button coat generally has a little more structure and flatters taller men. There's also the less common single-button coat that is very clean and very formal. The other option, double-breasted suits, are a beautiful thing when done right, but they take courage and experience to wear. The first time out, we recommend going with two buttons. Keep it simple.
That same advice goes for choosing the buttons themselves. A good horn button in a deep brown will almost always do the trick.