We might not have much information on Princess Eugenie's gown, but we do know she will reportedly wear the York tiara. The bejewelled headpiece was worn by her mother, Sarah Ferguson, when Sarah married Prince Andrew in 1986. And though it was never confirmed, the tiara was thought to have been a wedding gift from the Queen and Prince Philip. Sarah has worn it on numerous occasions, and the pretty diamond piece would make the perfect royal touch to Princess Eugenie's wedding day look.