Prince Louis marked a significant departure from previous years at Trooping the Colour by wearing trousers instead of the customary shorts typically worn by young aristocratic boys. The seven-year-old prince's sartorial choice breaks with a longstanding custom that sees male members of royalty don shorts until they reach the age of eight.

Prince George, Princess Charlotte and Prince Louis made an appearance on the Buckingham Palace balcony for Trooping the Colour. See the best photos of the royal siblings.