The royal family observes many traditions, from dining etiquette to behavior at official events and how guests should be greeted.

According to a source close to the Queen’s official dresser, Camilla made a specific request involving Princess Kate and Sophie, Duchess of Edinburgh. While all three are comfortable wearing blue for formal occasions, the final decision still rests with the Queen.

As Queen, Camilla holds the authority to decide which causes or matters to prioritize — even down to wardrobe choices within the Royal Family.

According to The Express, Camilla has been known to enforce specific rules about who can wear certain colors. Her personal stylist, Jacqui Meakin, reportedly had to test several fabric samples — even “dyeing a few pens” at the palace — to meet the Queen’s standards. Blue is often a key color in these guidelines.

Eventually, Kate and Sophie were permitted to wear blue as well, but only if the shade was bold enough, despite Camilla’s earlier reputation for being quite particular.