What if the heir to the thrown had a very big head and the crown was too small it would look a bit daft what would they do make another one? Or is it very large and they stuff it with newspaper so it fits?
I think there is enough room INSIDE the head for the stuffed newspapers! Anyway, his ears would stop it from slipping down, and Camilla would be sure to stop it bouncing off upwards, having spent a lifetime trying to get it on!