Royals 3 Generations of Royals, 1 Blue Onesie: All About Prince George's Heirloom Outfit When Prince George wore a blue suit to his Buckingham Palace bow, he followed his dad and grandpa in a private family tradition By Simon Perry Published on June 17, 2015 02:00 PM Share Tweet Pin Email Photo: Rex USA From the palace to the polo field, Princess Kate and son Prince George are breaking tradition and changing the Royal rules. Subscribe now for an inside look at their adorable adventures only in PEOPLE! There may be more hidden history to the sweet outfit that Prince George wore to his Buckingham Palace balcony debut Saturday. In this week’s cover story, a Palace source tells PEOPLE that the sky-blue outfit, complete with frilly collar and trim, was “stored privately by the family” after Prince William wore it for his own balcony bow at age 2 in 1984. But the family heirloom may go back even further. It bears an uncanny resemblance to one that Prince Charles was pictured wearing when he was photographed with his mother, the then-Princess Elizabeth, by Cecil Beaton around 1950. A young Charles also appears to be wearing a similar look in a photo taken with his baby sister, Princess Anne. Royal sources can t say who made the suit or from where it came from originally, adding to the mystery. But one insider agrees that it s “probably” the same outfit, while a second source concedes that the instincts are correct. “It does look remarkably similar,” says the source. Ingrid Seward, author of A Century of Royal Children, notes that the choice is reflective of George’s mom, Princess Kate, and her interest in honoring the past. “Kate is an art historian and she likes making these set-piece statements,” says Seward. “She really has looked back at the portraits she is working off those.” RELATED VIDEO: Princess Kate’s Body-After-Baby Secret Weapon It also proves another point about the royals. “They never throw their significant clothes away!” Seward adds. (Further proof: Princess Anne wore a 35-year-old outfit to Royal Ascot on Tuesday.) For much more on Princess Kate’s sweet bond with Prince George – and how they’re both changing the royal family – pick up this week’s issue of PEOPLE, on newsstands Friday. Want to keep up with the latest royals coverage? Click here to subscribe to the Royals Newsletter.