So, all these things you can get from Doyle, and when other actors who play Holmes and just pop on the deerstalker, and his cape and the pipe and walk straight through it, puff…puff…puff–and get on with the next thing–that’s probably the safer way to train – but it’s not exactly being true to Doyle. It’s just an image, like a cliché, which is not real.
— 

Jeremy Brett

(Speaking of Holmes only wearing the deerstalker in the country and the different pipes he used depending on his mood)