George originally wore the cardigan in a 2016 family portrait, which was commissioned for Queen Elizabeth's 90th birthday (see the photo here).
While his sister was wearing his clothes, George opted for a rare fashion change of his own - the tot ditched shorts in favor of trousers.
Prince Harry and the former Meghan Markle, the Duke and Duchess of Sussex, went for an artsy ambiance.
Harry's older brother Prince William, his wife Catherine, and children Prince George, 5, Princess Charlotte, 3, and Prince Louis, eight months, were photographed in the gardens of their country home, Amner Hall, in rural Norfolk.
The only member Meghan's family who was invited to her wedding was her mother, Doria Ragland.
Soon after, a sweet image of first-in-line Prince Charles and wife Camilla was also uploaded.
Messervy, who worked in the Master of the Household's department and helped plan many high-profile Royal events, reveals: "Presents are given traditionally on Christmas Eve".
Harry and Meghan have been living at Nottingham Cottage on the grounds of Kensington Palace since announcing their engagement previous year.
On Christmas Day, they join the congregation for the morning service at St. Mary Magdalene Church in Sandringham. Also? Love that the entire family is matching, but not in a matchy-match way. "But of course the Queen and her family, perhaps in many ways no different that other families, there are feuds, there are rifts".
The royals are due to spend Christmas together as per tradition at the 92-year-old Queen's Sandringham residence.