Matching bridesmaid dresses came out of the tradition of bridesmaids wearing the same dress as the bride to distract and trick evil spirits? Similarly a veil was also a tradition used to ward off evil spirits. A father walking her daughter down the aisle was a sign of transferring control, leadership and ownership from father to the new husband.
Paper invitations were started with England aristocracy, they would hire monks to write them and only the elite knew how to read. Before that they had the town crier shout it out. Wedding cakes come from also a wish of fertility, first it was a loaf of bread broken over the bride that later moved to kissing over spiced cakes and cookies which then got made into a tiered cake!