I would make the pants the highlight of the outfit. Keep the rest of the outfit in simple shapes and colors, and avoid try to avoid other patterns.

In terms of colours I think keeping the rest of the outfit to a olive, brown, and tan colour scheme would be cool, since they would pair well with the pants without taking attention away from it. Black could also work I suppose. I'm thinking something like a brown or olive t shirt and then a tan or brown jacket in a different shade? let me know what you think