Much depends on the color, there is a pale, there is a bright, it also affects.
White, black, black and white, gray, dark grey, coffee color, dark or pale etc.
I think the pants do not have to be bright on a background of black jacket, but a matter of taste.
For Example
http://www.sagaouterwear.com/products/anomie-2l-pant?variant=779388169 - everything except green red and blue