“Armstrong-Jones married Princess Margaret in 1960 and this provided ... by Paolo Roversi and William and Kate’s engagement ...

Another highlight of the exhibition is an 18th-century-style blue and gold ball gown designed by Oliver Messel, which Princess Margaret wore to a charity event at London's Mansion House in July 1964.

Princess Margaret, the Countess of Snowdon, was a member of the English royal family. She was the daughter of King George VI and Queen Elizabeth and the younger sister of Queen Elizabeth II.