Gentlemen: There's really nothing as sophisticated as a man in classic black tie, but not everyone has a tux hanging in their closet! Black tie-optional refers to a dress code in which a tuxedo/dinner jacket (black tie) is requested, but guests have the option to wear a dark business suit if they so choose. Ladies: A night for you to look your most gorgeous! Embrace it and have fun. Wear a long formal gown (if you have the opportunity to wear one, my attitude is why not?) or a shorter fancy cocktail dress that is "black tie" appropriate.