LONDON — Blue blood.

The British royal family gathered at Windsor Castle for its first Easter Sunday appearance since Queen Elizabeth II’s death and a month before the coronation of King Charles III.

The Firm was united together in a royal blue hue, with the king, Queen Consort Camilla and the Waleses wearing the shade to signal their seniority.

Kate Middleton wore a bespoke Catherine Walker coat that contains a velvet collar with angular shoulders and sits at mid-shin with a blue hat. She debuted the coat ultimately 12 months’s Commonwealth Day Service.

Prince William and Prince George each wore navy suits with the young prince wearing a blue necktie; Princess Charlotte was in a navy coat with blue tights and a ribbon in her hair, and Prince Louis wore a navy blazer and necktie with a blue shirt and shorts.

The king and queen wore similar shades of royal blue as they lead the family into St. George’s Chapel at Windsor Castle.

Sartorially, the Prince and Princess of Wales have been “stepping up a level. Should you look back at their trajectory as a pair, for a really very long time they were seen as very relatable, very down-to-earth and quite casual. I believe what we’ve seen somewhat bit more of in recent months is them looking way more serious,” like they mean business, said Bethan Holt, writer of “The Queen: 70 Years of Majestic Style” and “The Duchess of Cambridge: A Decade of Modern Royal Style.”

Because the queen’s passing in September, the duties and responsibilities of the Princess of Wales have increased together with those of Prince William, the heir to the throne.

The Millennial Prince and Princess of Wales have made clear from the beginning that they wish to be modern royals, in contact with their subjects and with the problems of the day. They wish to be seen as compassionate change-makers, advocates for British charities and other people, and powerful parents to their three children.