Dear Distressed About the Dress,
There is a long-standing custom to not wear a black dress to a wedding. Times are changing, but I would ignore this custom at your peril. It’s not worth being accused by people you care about that you are insulting the couple getting married or the occasion, and it’s not worth worrying during the whole celebration that anyone whose conversation you can’t quite make out on the other side of the room is talking about you.
Now, I did once wear a black dress to an evening wedding in Manhattan. That’s about the only time you can get away with it. An elderly woman asked me if I was a model. I should have said yes.
And have fun.
(Photo: A collection of black dresses by Valentino at the exhibition “Valentino a Roma” at Museo Ara Pacis in Rome. By Loquax via Wikimedia Commons)