Got my replacement tan IronClad pants today, I have climbed twice wearing the black ones, I think they work well for climbing- tough fabric, good range of of motion (it has a diamond gusset crotch panel), not unreasonably hot, comfortable with a saddle. I thought I would need to cut off the hammer loop, but it hasn't been an issue so I'm leaving it.
Sherrill is an IronClad dealer, they should think about maybe carrying the pants also.