The curator of the latest exhibition at Princess Diana’s former home gives his guide to the royal dress code ahead of a new exhibition Simon Perry is a writer and correspondent at PEOPLE.

"She's conforming to the code on the invitation of wearing the day dress. But she does it in her own way,” Storey says. “She’d have known the historic rules of court dressing, which included ...

Princess Diana on a tour of a gulf state and the Bruce Oldfield gown worn at a private event in Saudi Arabia in 1987 ...