There is a company called Bare (canadian company I think) Waders made by the Fitzwright Company in Langley British Columbia -that will custom make neoprene waders for you. I am 6'6 and the local sporting good store carried their line. Several guys in my duck club are short and stocky and couldn'tt find waders that fit until they found Bare. They had waders made for them and are very satisfieid. Mine have been fine.
The salemsman at the sporting goods store took all kinds of measurements, called them into the factory and I had them in about 4 weeks. Price was more than off the shelf; however, nothing off the shelf ever fit me.
I don't know what to tell you if you want gortex type stuff-- call directly to Simms and see what they have to say.
Good luck.