My daughter would like to know what to wear to a formal, evening wedding. The ceremony is in a cathedral, followed by a dinner and reception.
She should wear a fancy cocktail dress or suit (not long).
The key to the wedding’s formality is the invitation. “Black Tie” (as a corner copy on the invitation), means the wedding is formal, requiring formal attire for both men and women.
“Black Tie Optional,” for example, would indicate that the wedding is semi-formal, requiring fancy attire, but not requiring formal wear (tuxes) as far as the male guests are concerned, who may wear suits.