Go to a store that carries a few brands and try them on. Vanson, Astar, Dianese, Joe Rocket, AGV,.... all fit different. At 6'2"and 200, I am a 46 and wear an AGV suit. It is a bit big in the chest but allows for a back protector/chest protector. As others have said, if you can stand up comfortably or don't struggle to get in/out, it is too big. 2 piece is most likely a better bet as you have more options for seasonal riding vs a 1 piece.