In the past, royal brides and grooms didn't attend their own wedding receptions as they were by then heading off on their honeymoon, so one wedding dress sufficed. However when William and Kate got married they wanted to celebrate with their loved-ones, and stretched the day out for as long as possible. A daytime wedding and separate evening reception called for a change of outfit (later Kate wore a second McQueen gown, with a matching angora bolero), and Harry and Meghan will follow suit.