The most eye-catching, regal fashion at the coronation of King Charles

It was a veritable rainbow of fashion on an otherwise grey and rainy coronation day for King Charles III.

A mix of royals, celebrities, world leaders and dignitaries flocked to Westminster Abbey to witness the crowning of Charles and Queen Camilla.

While members of the Royal Family stuck with traditional regalia, the day’s other guests sported cheerful colours and fine fascinators.

Under her regal robe, Kate Middleton, Princess of Wales, donned an Alexander McQueen ivory silk crepe dress adorned with silver bullion embroidered roses, thistles, daffodils and shamrock motifs — a nod to the nations of the United Kingdom. She also wore a pair of drop-pearl earrings featuring plenty of diamonds, that once belonged to her late mother-in-law, Princess Diana.

Princess Charlotte was just like mom in a matching dress with identical motif, and both Kate and Charlotte wore bespoke silver bullion and crystal Jess Collett x Alexander McQueen headpieces with silver thread work.

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Singer Katy Perry turned out in a Vivienne Westwood pink tailored dress with matching waistcoat and tulle fascinator while Dame Emma Thompson shone in an Emilia Wickstead red coat emblazoned with roses — a nod to the national symbol of England.

First Lady of the United States Dr. Jill Biden attended with her granddaughter, Finnegan Biden, both wearing monochromatic outfits, one yellow and one blue, reportedly representative of the colours of the Ukrainian flag.

The dress code for the day called for day dresses on the ladies, while men were invited to wear morning coats, suits or uniforms. Many turned out in national dress or decorations and wore insignia important to their countries.

Scroll for a peek at the day’s best looks.