Unknown to the Queen, the gown's designer added a secret detail to the inside of the dress Erin Hill is the Senior ... of PEOPLE's Royals coverage? Sign up for our free Royals newsletter to ...

With wartime rationing still in effect, the dress was paid for using clothing ... According to Hugo Vickers in his book Elizabeth, The Queen Mother, Hartnell's manager imported 10,000 tiny pearls ...

Elizabeth wore the dress again in 1967 ... and everyone had to be extremely cautious leading up to the big day because the Queen was in attendance. They had to make sure everyone who was attending ...