Can you wear a black dress to a wedding? The short answer is YES, of course you can. Showing up in a LBD used to be a wedding no-no. It was the color of funerals, and was sometimes even used to protest a wedding. But no longer -- those rules have gone the way of wearing white before Labor Day and mixing gold and silver. But before you put on your best floor-length Morticia Addams with matching wig and gloves take note: There are some general guidelines you should still follow. Here's how to wear black at a wedding while staying in the bride's good graces.