Sick as in "Jesus Christ, Why Would You Wear That?!?": A guy in the Village Halloween Parade who was wearing a jacket and nothing else. (No pants, no shoes, nothing.)
Sick as in "Holy Shit That's Fucking Incredible!": This guy who was a steampunk spider at the same parade.
Others that I saw & loved was Cobra Commander (guy was hilarious. Once it started poring, he shook his fist to the sky and said "Damn it all! I knew I shouldn't have unleashed that Weather Disruptor!"), a guy dressed up as a zombie WWII Russian (kept calling him Commodore Commissar), Ashly Williams (the Evil Dead one w/ a chainsaw for an arm, not the Mass Effect one.) and I know it's smug/douche-y/etc. of me to say this, but I loved me & my brother's Ghostbusters costumes. (we had to be the best ones there. The only other Ghostbusters we saw had the cheap ones that you can get from Party City that have an inflatable Proton Pack)