Hey 69muscle....you much do you weigh? I'm also 6'4", and I weighed about a buck seventy when I had a 32 inch waist. I'm about 215-220#, and have a 35/36 now.
Big and fat is right. When I find a normal shirt made to fit my neck, it balloons out around the stomach and waist area. I've since discovered the "french cut." They fit pretty well.
Don't feel bad tall bros I'm only 5'6 216 and I can't find hardly anytype of closes that fits right either, BTW hows the weather up there its cool at my level right now ?
Most of their clothes are cut with more of V Shape to them and they do have large and extra large sizes. If money is an issue check their outlets because all the large stuff ends up not being sold.
I go once or twice a year to Italy and buy the stuff direct. You can get $3000 suits for $700.