I'm thinking about doing an Arkham Knight. I made one shoulder plate a few weeks back, just not sure if I want to press on.
I too was unhappy with the pants I found, so I have the bright idea of just getting some regualar black cargo or "tactical" pants, making a handful of stencils, and spray painting the red camo on myself. Maybe some white too, dunno. In some pictures I don't see any white at all and on others I do see a little bit.
I bought a cheapojacket to start as a base to modify on amazon but wasn't happy with it so I sent it back. You're welcome to try it though.. I'm leaning towards cloth track jacket to get the high collar but still be tight fitting like his, then maybe add on some pleather accents on top of it.
http://www.amazon.com/Mr-Baidis-Men...sim_193_2?ie=UTF8&refRID=0Y914Y3RDZCH6H341TW8
For boots, keep an eye on woot.com as they have Bates Zero Mass boots pop up from time to time, I got mine from there for my Arrow costume and I just plan on reusing them.