“Pennies or small weights are sewed into the hemlines of dresses to avoid them being blown up by a strong gust of British wind.

“Royal women are also discouraged from showing off their cleavage.

“In order to still wear bespoke dresses with daring necklines, the Duchess of Cambridge has her evening gowns altered ever so slightly to keep with the rules.

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