But a new book, HRH: So Many Thoughts on Royal Style by royal style expert Elizabeth Holmes, is shedding a new light on the meaning behind Her Royal Highness's penchant for hats.
People reports that Holmes spoke to British historian Robert Lacey, who explained, "Very few modern women wear a hat as part of their work uniform, aside from perhaps members of the armed forces...It's a reminder that the Queen is indentured to a service, to a job."
It's not the only royal fashion choice with a bigger meaning behind it. On a recent episode of the Royally Obsessed podcast, Holmes chatted with hosts Rachel Bowie and Roberta Fiorito about Meghan Markle's fashion over the years. Holmes revealed that Markle drew inspiration from her Suits character, Rachel Zane, whose wardrobe reflected how she was feeling. (For example, if she wore red, she was in love.)