Anita McBride, who served as former first lady Laura Bush's chief of staff from 2005 to 2009, previously told Insider that Queen Elizabeth's dressmaker used to confer with the staff of US first ladies to make sure their outfits wouldn't clash during visits.
"Those kinds of behind-the-scenes conversations are really part of the larger planning and protocol and discussions that go into an event like that — down to clothing, food, menu, and flowers, and all of those things," she said. "When it's done right, it conveys a great sign of interest and respect in your guest and pride in how the US and how the president and first lady have welcomed a foreign visitor."
In "Harry & Meghan," Meghan indicated this rule applies to actual members of the royal family, as well.
She said she "rarely wore color" while in the UK because of royal protocol rules about outfit colors at public appearances, Insider's Rebecca Cohen and Amanda Krause reported.
"To my understanding, you can't ever wear the same color as Her Majesty, if there's a group event," she said. "But then you also should never be wearing the same color as one of the other more senior members of the family."
That wasn't the only reason Meghan chose such a simple color palette, she said.
"It was also so I could just blend in," she said. "I'm not trying to stand out here. There's no version of me joining this family and trying to not do everything I could to fit in."