My best friend is getting married and i am the moh. We are having trouble figuring out what colors the groom and best man tuxs are suppose to be. The wedding is in shades of purple and there are only 4 people in the wedding party, the bride and groom (of course) and the MOH and best man. should the tux vests be the same color or should the grooms be different than the best mans or should it be the same color or what?