The Duchess of Cambridge visited Imperial War Museum London on Wednesday to view letters relating to the three brothers of her great-grandmother, Olive, all of whom fought and died in the First World War.
As millions of American step out with clever and unique looks for the holiday, Kate Middleton chose to keep things classy and lovely once again as she attended a special event.
Prince William and Kate Middleton are making their next joint appearance together next week.
Francis Martineau Lupton, the Duchess's great-great-grandfather, had five children. His three sons Francis, Maurice and Lionel were all killed in action while serving during the First World War.
The eldest brother, Major Francis Lupton, served with the 8th Battalion West Yorkshire Regiment and was killed by a bomb in February 1917, when he was 31.
The Duchess was shown several of the documents including a letter of condolence to her family from the Keeper of the Privy Purse at Buckingham Palace. The two youngest brothers, Captain Maurice Lupton and Lieutenant Lionel M Lupton went to France within three days of each other in 1915.
The duchess was shown the letter the brothers sent home, a field service postcard and a telegram informing the Middleton family the body of one of the brothers, Francis, had been found.
Armistice Day is November 11 in England, and many people sport poppy pins during the month leading up to it.
Yesterday the Duchess and the Duke paid a visit to Basildon Sporting Village in Essex to learn how one of their projects, Coach Core, is inspiring a community with sport.
Royal-watchers claim it's merely the first sign of a sea change for William's wife, 36, who they say is declaring herself "back with a bang" after her time off as she settles comfortably into the role of future Queen consort - while her new sister-in-law Meghan takes over as "princess in training".