6. Jeans Are Not Always Allowed

Reason: Exclusively for casual events
Except: Never dress in formal attire.
Jeans are totally OK for royals to wear, but not to formal events. If it’s a formal event, not even dark-washed jeans and heels are appropriate. Jeans are only appropriate for casual outings with minimal dress codes.
Jeans are not always allowed. ©Karwai Tang via Getty Images
In actuality, Kate Middleton’s favorite casual outfit consists of jeans and sneakers. When it comes to dressing down, Charlene of Monaco goes for a t-shirt and leather jacket. Not to mention that Princess Diana wore motorcycle shorts, which are currently back in vogue.