WINDSOR, ENGLAND - JUNE 13: Catherine, Duchess of Cambridge chats with guests after the Order of the Garter Service at Windsor Castle on June 13, 2016 in Windsor, England. Today the traditional Garter parade was cancelled in favour of dignitaries arriving in cars due to the inclement weather. (Photo by Chris Jackson/Getty Images)

WINDSOR, ENGLAND - JUNE 13: Catherine, Duchess of Cambridge, Camilla, Duchess of Cornwall and Sophie, Countess of Wessex chat with guests after the Order of the Garter Service at Windsor Castle on June 13, 2016 in Windsor, England. Today the traditional Garter parade was cancelled in favour of dignitaries arriving in cars due to the inclement weather. (Photo by Chris Jackson/Getty Images)

WINDSOR, ENGLAND - JUNE 13: A policeman helps members of the public with their umbrella during the Order of the Garter Service at Windsor Castle on June 13, 2016 in Windsor, England. Today the traditional Garter parade was cancelled in favour of dignitaries arriving in cars due to the inclement weather. (Photo by Chris Jackson/Getty Images)

WINDSOR, ENGLAND - JUNE 13: The Royal Standard flies above Windsor Castle for the Order of the Garter Service at Windsor Castle on June 13, 2016 in Windsor, England. Today the traditional Garter parade was cancelled in favour of dignitaries arriving in cars due to the inclement weather. (Photo by Chris Jackson/Getty Images)

WINDSOR, ENGLAND - JUNE 13: Royal guests arrive in cars for the Order of the Garter Service at Windsor Castle on June 13, 2016 in Windsor, England. Today the traditional Garter parade was cancelled in favour of dignitaries arriving in cars due to the inclement weather. (Photo by Chris Jackson/Getty Images)

WINDSOR, ENGLAND - JUNE 13: The Royal Standard flies above Windsor Castle for the Order of the Garter Service at Windsor Castle on June 13, 2016 in Windsor, England. Today the traditional Garter parade was cancelled in favour of dignitaries arriving in cars due to the inclement weather. (Photo by Chris Jackson/Getty Images)

WINDSOR, ENGLAND - JUNE 13: Guests arrive in the rain for the Order of the Garter Service at Windsor Castle on June 13, 2016 in Windsor, England. Today the traditional Garter parade was cancelled in favour of dignitaries arriving in cars due to the inclement weather. (Photo by Chris Jackson/Getty Images)

WINDSOR, ENGLAND - JUNE 13: Queen Elizabeth II arrives in a car for the Order of the Garter Service at Windsor Castle on June 13, 2016 in Windsor, England. Today the traditional Garter parade was cancelled in favour of dignitaries arriving in cars due to the inclement weather. (Photo by Chris Jackson/Getty Images)