What color dress pants should I wear with a Navy shirt? Black or Grey? If either, which color tie? Black or light Grey? I'm wearing Black shoes & belt with these. Outfit A) I've heard to not mix Navy & Black so I'm leaning toward Navy shirt + Grey pants. But is it okay if my pants are on the dark side and my Grey tie is lighter? Or would that mess things up? Outfit B) I can also just wear a White shirt, Dark Grey pants, and a Navy sweater. Should I then wear a Black or Light Grey tie?