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FLORENCE, ITALY - APRIL 03: Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall attend an event for the Italian Wool Industry and the Prince of Wales's Campaign for Wool at Palazzo Pitti, on April 3, 2017 in Florence, Italy. Their Royal Highnesses will be introduced to representatives from Woolmark and the Campaign for Wool, view product demonstrations, learn about innovative wool techniques and be given a tour of the palace's Art Gallery. The Prince of Wales launched the Campaign for Wool in January 2010 as an initiative to expand the market for British and Commonwealth wool and promote awareness of its environmental benefits. (Photo by Chris Jackson/Getty Images)

FLORENCE, ITALY - APRIL 03:  Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall attend an event for the Italian Wool Industry and the Prince of Wales's Campaign for Wool at Palazzo Pitti, on April 3, 2017 in Florence, Italy. Their Royal Highnesses will be introduced to representatives from Woolmark and the Campaign for Wool, view product demonstrations, learn about innovative wool techniques and be given a tour of the palace's Art Gallery. The Prince of Wales launched the Campaign for Wool in January 2010 as an initiative to expand the market for British and Commonwealth wool and promote awareness of its environmental benefits.  (Photo by Chris Jackson/Getty Images)

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DUNEDIN, NEW ZEALAND - NOVEMBER 5: Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall continue to laugh after a bubble bee took a liking to Prince Charles during their visit to the Orokonui Ecosanctuary on November 5, 2015 in Dunedin, New Zealand. The Royal couple are on a 12-day tour visiting seven regions in New Zealand and three states and one territory in Australia. (Photo by Rob Jefferies/Getty Images)

DUNEDIN, NEW ZEALAND - NOVEMBER 5:   Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall continue to laugh after a bubble bee took a liking to Prince Charles during their visit to the Orokonui Ecosanctuary on November 5, 2015 in Dunedin, New Zealand. The Royal couple are on a 12-day tour visiting seven regions in New Zealand and three states and one territory in Australia. (Photo by Rob Jefferies/Getty Images)

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LONDON, UNITED KINGDOM - DECEMBER 18: In this handout image released by Clarence House, the image used on The Prince of Wales's and The Duchess of Cornwall's Christmas card displays Camilla, Duchess of Cornwall and Prince Charles, Prince of Wales as they are seen viewing horses in the parade ring from the Royal Box on the second day of Royal Ascot on June 19, 2013 in London, England. Clarence House are asking that publications which use the photograph consider making a modest donation to The Prince of Wales's Charitable Foundation - donations should be made payable to The Prince of Wales's Charitable Foundation and be sent to Amanda Foster at The Prince of Wales and The Duchess of Cornwall's Press Office, Clarence House, London SW1A 1BA. The photograph was taken by taken by Stephen Lock. Please credit taken by Stephen Lock / i-Images if you use this image. (Photo released by Clarence House via Getty Images)

LONDON, UNITED KINGDOM - DECEMBER 18:  In this handout image released by Clarence House, the image used on The Prince of Wales's and The Duchess of Cornwall's Christmas card displays Camilla, Duchess of Cornwall and Prince Charles, Prince of Wales as they are seen viewing horses in the parade ring from the Royal Box on the second day of Royal Ascot on June 19, 2013 in London, England. Clarence House are asking that publications which use the photograph consider making a modest donation to The Prince of Wales's Charitable Foundation - donations should be made payable to The Prince of Wales's Charitable Foundation and be sent to Amanda Foster at The Prince of Wales and The Duchess of Cornwall's Press Office, Clarence House, London SW1A 1BA. The photograph was taken by taken by Stephen Lock. Please credit taken by Stephen Lock / i-Images if you use this image. (Photo released by Clarence House via Getty Images)

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LONDON, UNITED KINGDOM - JUNE 11: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge, Camilla, Duchess of Cornwall and Eloise Taylor stand on the balcony of Buckingham Palace after the Trooping the Colour Parade on June 11, 2011 in London, England. The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. In 1748, it was decided that the parade would be used to mark the official birthday of the Sovereign. More than 600 guardsmen and cavalry make up the parade, a celebration of the Sovereign's official birthday, although the Queen's actual birthday is on 21 April. (Photo by Indigo/Getty Images)

LONDON, UNITED KINGDOM - JUNE 11: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge, Camilla, Duchess of Cornwall and Eloise Taylor stand on the balcony of Buckingham Palace after the Trooping the Colour Parade on June 11, 2011 in London, England. The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. In 1748, it was decided that the parade would be used to mark the official birthday of the Sovereign. More than 600 guardsmen and cavalry make up the parade, a celebration of the Sovereign's official birthday, although the Queen's actual birthday is on 21 April. (Photo by Indigo/Getty Images)

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DELHI, INDIA - OCTOBER 03: Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall enjoy the Opening Ceremony for the Delhi 2010 Commonwealth Games at Jawaharlal Nehru Stadium on October 3, 2010 in Delhi, India. (Photo by Feng Li/Getty Images)

DELHI, INDIA - OCTOBER 03:  Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall enjoy the Opening Ceremony for the Delhi 2010 Commonwealth Games at Jawaharlal Nehru Stadium on October 3, 2010 in Delhi, India.  (Photo by Feng Li/Getty Images)