I kind of like the idea of him wearing a light suit, not something that you would necessarily see on a stereotypical villain — the big black cloak and the black hat — and I just wanted to do sort of the opposite of the stuff I may have imagined Moriarty to wear. — Andrew Scott

Hi-res pic: Best Supporting Actor winner Andrew Scott at the Arqiva British Academy Television Awards 2012 on May 27, 2012 in London. Congrats, Andrew!!! :D
That is a nice suit.