Correctly complementing red trousers might seem to be an intimidating task at first thought. But by following a few simple outfit colour scheme guidelines, you can make a bold fashion statement in red trousers. Good colours to complement red trousers include white, black, beige, brown and grey. Neutral colours complement the red without making the outfit seem too bright. With a little outfit planning, anyone can wear an outfit based around red trousers that looks as if it's expertly designed.