Tights Are a Must
We can't start this without mentioning Meghan's first appearance after the royal wedding, when she was seen wearing tights. People seem to really care that Meghan chose to follow protocol when it comes to the queen's strict rule about wearing sheer tights, despite the warm May weather.
Compare this to the engagement photo call in November, when Meghan went barelegged. It seems that since becoming a duchess, she's decided to adhere to this rule no matter the time of year.