Knowing the terminology of men's formal wear will help you decide what color suit to wear to a wedding. If you are informed that you are going to a black-tie affair, that means you should wear a tuxedo, without exception. The wedding planner and bride probably envision this being an elegant soiree. Stick with a traditional black tuxedo, white shirt and black bow tie. Full evening dress requires a tuxedo with tails. If the wedding is black-tie optional, you can wear a different color suit besides black. Stick with classic dark colors to avoid standing out.