Louis' uncle, Prince Harry, wore the blue and white shirt with Princess Anne at the Trooping the Colour in 1986.
The ceremony sees 1,400 soldiers, 200 horses and 400 musicians parade central London to celebrate the monarch's birthday.More news: Brazil 7 - 0 Honduras - Match Report & Highlights
According to Express UK, as the Duchesses of Cambridge and Cornwall arrived on the balcony of Buckingham Palace for the event and awaited the Queen's arrival, they notably did not curtsy as her carriage pulled in past the gates-even as Sophie, Countess of Wessex and her daughter, Lady Louise Windsor, did.
Fans noticed what looked to be a new, third band on Markle's wedding finger.More news: China may restrict tech access in spiraling USA trade dispute
William and Catherine took turns holding their youngest child as the royal family watched the traditional Royal Air Force flyover on the balcony of Buckingham Palace.
Theresa May, who formally stepped down as prime minister on Friday but will continue to work until her successor has been appointed, also attended the event.
Eternity rings are also described as infinity rings and are said to symbolise "everlasting love". Markle had described the President as "misogynistic" in a 2016 interview, and reportedly stated she would move to Canada if Trump were to become president. Maybe, we could get a better look at baby Archie or an intimate moment between the father and son duo might be shared by the royal couple. The newborn ostensibly slept through the media appearance.More news: Cyberpunk 2077 is out next April - and it has Keanu Reeves