This idea depends on how much you are willing to pay. I offer this as just one possible route to getting what you want – you can get custom sized soft shell pants (and jackets) from Beyond Clothing (formerly Beyond Fleece). Also customizable pockets, and so on.
I am hard to fit and I figured if I was going to pay the bucks to get something made out of the best material I might as well pay the %50-70 premium to get exactly what I wanted. I still do most of my trips in the same pair of these I have had for 7-8 years:
http://www.beyondclothing.com/shop/mens-outdoor-apparel/pants/products/roughrider-pant-d-steel
The stretchy Scholler is amazing and can even stand up to butt-sliding (just this side of actual rock climbing) maneuvers on slickrock during a 2 week trip through Canyonlands NP. Check out their web site for the other stuff they offer. The roughriders are almost perfect bulletproof hiking pants and water rolls right off of them. They have winter stuff too.
However, I'm sure others can offer more economical alternative suggestions. I do know that mine have lasted a lot more than twice as long as the typical nylon pants I have hiked in in the past, so in the end I have no problem with their net economy. They used to (possibly still do) mail out swatches of the different materials they use if you ask them. For what they are they cost in the same ball park as Patagonia, but tailored custom to your measurements.