I'm going as Gilligan....white pants, keds, red shirt...gilligan hat. Someone else could be Skipper....
Last year I was Inspector Clouseau....mans hat (forget the name...I rented it froma costume shop for under $10), DH's old Burberry trench coat...bought a moustache ($5)....
I get all of my costume ideas from DDs. Teens always have great ideas!