The question has been asked If an invitation reads “Black Tie Optional” what does this mean? This
usually means that the host would like men to dress up in a tuxedo and women in
an evening gown, but doesn’t want to enforce it. Should you own a tux then you
should wear it to the event! If you don’t, and do not want to rent one, then a
dark gray or black suit, white dress shirt, and an elegant solid color tie (best are
black or silver) will be a good alternative with a white or silver pocket square.