Centuries ago, Christian weddings were only allowed in a church. The Bride and Groom dressed in a specified clothing so they could be recognized by the invited guests. But the bridesmaids were dressed in clothing similar to the bride and the ushers were dressed almost exactly as the groom.
Question for the Reader: Have you ever been to a church wedding where the bride and bridesmaids were not dressed in the expected clothing? But the groom, his best man and his ushers were dressed exactly in the same way? A BLACK SUIT ? The evil spirit could not know which man was the groom.