One of the biggest staples of the Royal Family's calendar, Trooping the Colour, took place this weekend, marking the official birthday of King Charles. Although his real birthday actually falls in November, the event traditionally takes place in June to celebrate whoever is monarch at the time.

This year, we saw all the senior royals gather together for a carriage procession as well as balcony appearance, waving to the public as they witnessed the iconic flypast. The Prince and Princess of Wales joined along with their three children - Prince George, Prince Louis and Princess Charlotte - but it was Kate's pale blue ensemble that particularly caught our eye, for a number of reasons.

london, england june 13: (l r) prince richard, duke of gloucester, birgitte, duchess of gloucester, prince edward, duke of edinburgh, sophie, duchess of edinburgh, vice admiral sir timothy laurence, princess anne, princess royal, queen camilla, king charles iii, prince william, prince of wales, princess charlotte of wales, catherine, princess of wales, prince george of wales, prince louis of wales and prince edward, duke of kent watch an raf flypast from the balcony of buckingham palace during trooping the colour on june 13, 2026 in london, england. trooping the colour is a ceremonial parade celebrating the official birthday of the british monarch. the event features over 1400 soldiers of the household division and kings troop royal horse artillery, including over 400 musicians from the massed bands. (photo by karwai tang/wireimage)
Karwai Tang

In previous years at Trooping the Colour (and other public appearances), Kate has traditionally co-ordinated her looks with her only daughter, Princess Charlotte. This has meant channelling similar styles and colours to create a symbiotic comparison, without being completely matching. This year, however, The Princess of Wales changed tack and decided to co-ordinate with her sons, Princes George and Louis, instead, who wore matching suits.

london, england june 14: catherine, princess of wales and princess charlotte of wales on the balcony at buckingham palace during trooping the colour 2025 on june 14, 2025 in london, england. trooping the colour is a ceremonial parade celebrating the official birthday of the british monarch. the event features over 1,400 soldiers and officers, accompanied by 200 horses. more than 400 musicians from ten different bands and corps of drums march and while performing. (photo by karwai tang/wireimage)
Karwai Tang
Kate and her daughter co-ordinating outfits last year.
london, england june 15: prince george of wales, prince william, prince of wales, prince louis of wales, princess charlotte of wales and catherine, princess of wales on the balcony of buckingham palace during trooping the colour on june 15, 2024 in london, england. trooping the colour is a ceremonial parade celebrating the official birthday of the british monarch. the event features over 1,400 soldiers and officers, accompanied by 200 horses. more than 400 musicians from ten different bands and corps of drums march and perform in perfect harmony. (photo by karwai tang/wireimage)
Karwai Tang
The Princess of Wales and Princess Charlotte in nautical themed looks in 2024.

Kate chose a pale blue, double-breasted coat dress by Catherine Walker, paired with a statement hat in the same colour and white trim. Her sons co-ordinated with their mother in double-breasted blazers and ties in the exact shade of her ensemble. While Princess Charlotte's dress did feature a double row of buttons for some coherence with the other members of the family, her dress was white with puff sleeves with a statement bow on her frilled collar. Kate and Princess Charlotte have also been known to match their hairstyles, but on this occasion Charlotte chose a half-up style with a large bow, while Kate had an elaborate up-do to sit beneath her hat.

london, england june 13: (l r) prince william, prince of wales, princess charlotte of wales, catherine, princess of wales, prince george of wales and prince louis of wales wave from the balcony of buckingham palace during trooping the colour on june 13, 2026 in london, england. trooping the colour is a ceremonial parade celebrating the official birthday of the british monarch. the event features over 1400 soldiers of the household division and kings troop royal horse artillery, including over 400 musicians from the massed bands. (photo by chris jackson/getty images)
Chris Jackson
london, england june 13: (l r) princess charlotte of wales, catherine, princess of wales, prince george of wales and prince louis of wales watch an raf flypast from the balcony of buckingham palace during trooping the colour on june 13, 2026 in london, england. (photo by samir hussein/wireimage)
Samir Hussein

The Princess of Wales' outfit was also a standout on the day due to its similarity to an almost identical look worn by Princess Diana in 1987, also by Catherine Walker. While attending an Easter service, the late Princess stepped out wearing a pale blue, double-breasted coat dress and hat while hand-in-hand with Prince William. Just as Kate co-ordinated with her sons, Princess Diana had a matching look made for the young Prince William, who walked with her to the service alongside his cousin, Peter Phillips.

windsor, united kingdom april 19: diana, princess of wales, with her son, prince william and her nephew, peter phillips, on their way to easter service. the princess is wearing a pale blue coat designed by catherine walker who made a similar one for prince william (photo by tim graham photo library via getty images)
Tim Graham

Those attending this year's Trooping the Colour event included King Charles and Queen Camilla, Princess Anne, Sophie, Duchess of Edinburgh and the Duchess of Gloucester.