LOL at the idea of finding athletic apparel of any sort for 36" inseam.
Actually, I also have 36" inseam but I'm a little chubbier with 36" waist as well. I have a pair of Perl Izumi tights I bought about 5 years ago that fits pretty good, they may be ever so slightly too short but they do at least come down almost to the tops of my shoes. So my answer is that Perl at least used to make something that was pretty much tall enough. I'll try to remember this weekend to take a look at their tags and see what size and model they are listed as so you can at least have a reference of some sort.