According to business styling rules, the classic suit in the office should not be black, since it could be too dominant to the opposite. Recommended are usually dark blue and gray. I think this is only conditionally correct. For the classic black and white combination this might be true. But who plays with colors – for example with the accessories –, sets accents and can soften the effect in my point of view significantly.
In my example today, I combine red shoes and a red handbag with the classic black suit and a plain white blouse. The flat shoes I have chosen, because they do not apply additional – this can happen quickly with high heels. Overall this is one of my favorite outfits. For example, I wore it already for job interviews.