You can also consider going custom. Frequently they cost around the same as a good off-the-rack suit (unless you're chasing bottom of the bargain bin deals), but will fit even the most complex shapes MUCH better than any off-the-rack suit can.
Custom suit makers I can recommend are:
1)
LiquidFit
2)
AquaFlite
3)
Wetwear (only place to get
Rubatex wetsuits, the warmest, highest-quality neoprene there is)
4)
Terrapin Wet Suits
5)
Otter Bay
The first two get the most consistently positive raves from people who use their suits, and Wetwear, again, is the only one who can trick you out in the best neoprene made. (Lasts practically forever, 20-30 years not uncommon, will not compress nearly as much at depth, etc.)