The royal class seldom likes to part with its established customs — most of all the monarch, who is expected to preside over its functions. But queens can be rule breakers, too. The then-reigning Queen Elizabeth II bypassed tradition at her son King Charles III's nuptials at Windsor Castle by showing up in an all-white ensemble. At a wedding, that color is typically reserved for the most important person there: the bride. Interestingly enough, the no-white rule Elizabeth breached was one historically started by her great-great-grandmother Queen Victoria, who opted for a white gown at her own wedding in 1840. But since little about her son's second wedding conformed to old traditions, Elizabeth presumably saw it safe to indulge in a little harmless rebellion herself.
Anyhow, there was no issue of Her Majesty's white dress clashing with that of the bride Queen Consort Camilla, who had donned a blue silk gown and was dealing with far more concerning wardrobe troubles that day. As recalled in a heartwarming tribute to the queen after her death in 2022, Camilla had, in a moment of inattention, slipped on shoes with varying heel lengths for her blessing ceremony at the chapel. "I was halfway down in the car before I realized," she said, as quoted by Newsweek. Elizabeth, with her legendary sense of humor, noticed the faux pas and couldn't hold in her laughter. She did offer her daughter-in-law her sympathies though.