Poppies are worn as a mark of respect to those who died during the First World War and other conflicts and on Sunday, the royal family were among the thousands of people who wore poppies during the Remembrance Service.
However, Princess Kate noticeably wore three, as has become her preference over the years - but what's the significance behind it?
One theory is that the royals wear multiple brooches in honour of family members who have fought and died in wars.
Kate's great-grandmother had three brothers who were killed in action during the First World War and the Princess viewed letters from her ancestors during a poignant visit to the Imperial War Museum in 2018.
© GettyHowever, the reason for Kate wearing multiple poppies has never been confirmed by the palace.
Another theory is simply because a corsage of poppies is much more visible than one. Kate isn't usually the only one to wear multiple poppies as the late Queen Elizabeth II would often display five poppies when she stepped out for the special service.
© GettyWhile Buckingham Palace has never confirmed the reason for the monarch's preference, it is thought that Her Majesty's five poppies represented each service in the war: the Army, the Navy, the RAF, the Civil Defence and women.
© GettyIn 2019, for the Remembrance Sunday service, the Princess of Wales opted to wear a particularly special brooch.
© GettyKate chose to don The Codebreakers Brooch in honour of her grandmother Valerie Glassborow, Valerie's twin sister Mary and her great-aunt, who all served as codebreakers at Bletchley Park during the Second World War.
Listen to our Right Royal Podcast to hear all about Prince William's good deeds...
