I'm 5'10" and 230 pounds. I barely fit into a Bare (pun intended) XXL. An XXL Short fits me better but is not always available. The XXL is a little bit too long, but not bad. It is also a little too tight on the belly, but the extremely stretchy neoprene lets my breathe, so it is ok.
The problem is that the larger sizes are usually too long. So... if you can't find a standard size that fits, there are two alternatives: a custom suit, or getting a standard suit altered. The latter may be cost effective if you can get a good deal on the suit before it is altered.