I havent actually went to a convention yet, but I used to dress up as Peter Strahm all the time hahaha. Leather jacket, long sleeved black shirt, blue jeans, nice shoes. Id style my hair like his, carry a clicky pen wherever I went, and put a little patch of gauze on my throat.
I also put on lots of mascara because that man's eyelashes are out of this world.
"Dammit Jim I'm a Doctor, Not an Escalator!"