Check the fit that he linked just a few posts above. Looks perfectly fine.e: scratch that, those may be very, very dark navy pants. Still, I think it would look fine with black denim or black trousers.
Kamen Rider Gaim is fucking great. Super, super ridiculous first few episodes, and then it slides into a solid groove of mindfuck and "just live more!" awesomeness. If I'm not mistaken, the head writer for Gaim is the same dude who wrote Madoka. If you're familiar with that, then you should have a good idea of what you're in for.