Formal, Black Tie Optional, Black Tie Invited
isn't required, but the wedding is formal enough for one to be appropriate. Go with a dark suit if it's a nighttime wedding, regardless.Him:
If not a tuxedo, a dark suit and tie.Her:
A long dress, a really dressy suit, or something cocktail-length (but still formal). Glamorous makeup and dramatic jewelry and hair are appropriate.
Now that you know what to wear, make sure you know what to give:
See More: Going to a Wedding?