You are looking for a Halloween costume, I perceive. For those who even the Reichenbach Falls cannot break consider the Men's Sherlock Costume. It has everything a consulting detective could ever need right down to its deerstalker cap and (faux) Inverness cape. Even Moriarty would marvel at the majesty of these vestments. Sebastian Moran would hate this costume, but he hates everything. Screw that guy. Lestrade is cool, though. I bet he'd dig this costume.
Choosing the Men's Sherlock Costume for Halloween is elementary, my good man! Just stay away from that seven-per-cent solution, alright?