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Caroline de Guitaut, Senior Curator at The Royal Collection, poses for a picture in the White Drawing Room with (L-R) an Auxiliary Territorial Service overalls and cap worn by Princess Elizabeth Whilst serving in the wartime ATS, a Pale Blue and gold evening dress by Sir Norman Hartnell, a Turquoise silk shift dress with silver floral embroidery by Hardy Amies, an Outfit and hat designed by Sir Norman Hartnell and Outfit and hat designed by Angela Kellyand during the exhibition preview for "Fashioning a Reign: 90 Years of Style from The Queen's Wardrobe" at Buckingham Palace in London on July 4, 2016. / AFP / Daniel Leal-Olivas (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

Caroline de Guitaut, Senior Curator at The Royal Collection, poses for a picture in the White Drawing Room with (L-R) an Auxiliary Territorial Service overalls and cap worn by Princess Elizabeth Whilst serving in the wartime ATS, a Pale Blue and gold evening dress by Sir Norman Hartnell, a Turquoise silk shift dress with silver floral embroidery by Hardy Amies, an Outfit and hat designed by Sir Norman Hartnell and Outfit and hat designed by Angela Kellyand during the exhibition preview for "Fashioning a Reign: 90 Years of Style from The Queen's Wardrobe" at Buckingham Palace in London on July 4, 2016. / AFP / Daniel Leal-Olivas        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)