“Meanwhile her later mother-in-law, Princess Diana used to hold her clutch to her chest while exiting vehicles,” the expert noted.

Daena continued: “Royal women are expected to keep their coats on at social events, as disrobing in public is perceived as distasteful according to royal protocol.

“This would explain why so many royal women prefer coat dresses.

“However, more recently, the Duchess of Cambridge has bent this rule and taken off her coat whilst attending indoor events,” the expert claimed.