Seriously bold wedding guest dresses: Princess Beatrice, Zara Tindall and more rebellious royals

Known the world over as a style icon, the Princess of Wales has rarely ever taken a foot out of line when it comes to her fashion sense. But in a surprise high-profile appearance at Prince Harry and Meghan Markle's wedding in 2018, the former Duchess chose a rule-breaking colour. Kate stepped out in a cream Alexander McQueen silk coat dress and a Philip Treacy floral hat, colours that were very close to the bridal white guests traditionally avoid.

Who can forget one of Princess Beatrice's most memorable style moments? Sarah Ferguson sparked controversy when she stepped out in an oversized  Philip Treacy fascinator – which some compared to a pretzel – during the royal wedding of Prince William and Princess Kate Middleton at Westminster Abbey in April 2011.

Back in 2013, the late Queen's granddaughter attended Jake Warren and Zoe Stewart's nuptials at the Wren Chapel in London wearing a blue coat with a mustard fascinator. But nobody could tear their eyes away from her very unroyal footwear – towering black patent heels.

Princess Beatrice wore three stunning ensembles to her cousin Prince William's nuptials. For the private wedding reception at the Goring Hotel, hosted by Carol and Michael Middleton, Beatrice prioritised comfort with her white trainers peppered with colourful fruit prints, offset by her glamorous maroon gown finished with silver embellishments.

King Charles and Queen Camilla's 2005 was unconventional in many ways, and Zara Tindall embraced that with her psychedelic-print shirt dress and knee-high boots. Adding to her 60s-inspired ensemble, the royal added a black fedora and dangling pendant earrings.

Aged just 17, Princess Anne's daughter made a style statement at Santa Palmer-Tomkinson and Simon Sebag-Montefiore's big day at The Liberal Jewish Synagogue in St John's Wood.

She was spotted exiting a car in a dark ebony pinstripe mini skirt and matching blazer. Square-toed black mules and a black boater hat added the finishing touches to her modern work-chic ensemble.

The Princess Royal channelled 60s style at Lady Rose Windsor and George Gilman's nuptials in 2008. Anne chose an ivory summer frock with a wrapover bodice, a ruffle trim and subtle jacquard polka dots interspersed with a feminine orange floral print.

While her pearl necklace and lemon-coloured floral headpiece tied in with her chosen colourway, she added a pop of colour with her bright red lipstick.

Never one to shy away from colour, Princess Anne chose a colour-clashing ensemble for the Prince and Princess of Wales' wedding. A green floral coat was layered over the top of a purple dress in her show-stealing outfit.

Bronzed Princess Eugenie showed off her golden tan in a pearlescent dress at Chloe Delevingne and Louis Buckworth's wedding in September 2007. Pictured alongside her sister Princess Beatrice and mother Sarah Ferguson, 17-year-old Eugenie was all smiles in an ivory mini dress with a textured bandeau top and a shimmering skirt, which she teamed with a matching cream jacket with a pie-crust collar and brown embellished heels.

The Duchess of Edinburgh has undergone a significant style evolution over the years. Back in 1994, Sophie joined Prince Edward, at his former flame Anastasia Cooke's wedding. A far cry from her usual tailored suits and floral dresses, she fonned an unexpected high-shine metallic cropped jacket with a mosaic print and Queen Anne neckline alongside a simple black skirt.

She went for a 'more is more' approach to her accessories, choosing fur-trim black gloves and a large saucer-shaped hat covered with feathers.

Princess Diana rocked statement stripes as she attended the Sarah Brennan and Hugh Lyndsay's wedding. Designed by Roland Klein, Diana's outfit consisted of a horizontal striped navy and white skirt with a vertical striped oversized blazer, a white top and V-neck heels.