Look, the royal family has certain expectations — just ask Meghan Markle. So, someone like Catherine, the Duchess of Cambridge, doesn't have the same freedom when it comes to her hair cut, color, and style as certain celebs, who can dye their hair quarantine-blue one day, then debut a brand-new blonde a week later. Kate Middleton's hair lives by a strict code — and yet, the Duchess' brunette mane has become a source of admiration for many fans. Over her years as a royal, Kate's signature waves, intricate updos, and subtle highlights have been the subject of hair envy Pinterest boards...