The Duchess of Cambridge opted for the unusual fashion choice for her recent engagement at the Natural History Museum. The Duchess stunned in a black dress but the colour is normally only worn by royals on very specific occasions.

The Duchess of Cambridge always looks impeccable but there are actually lots of rules around what she can wear when carrying out her royal duties.

Kate Middleton is known for following the many royal rules with her outfits – including not wearing colourful nail varnish and carrying her bag in her left hand.

The royal mum-of-three even had her wedding dress approved by her grandmother-in-law to be.

But it looks like the top royal broke one of the Queen’s top fashion rules when she appeared on screen wearing black at a virtual public engagement recently.

The Queen, and other royals, typically only wear black when attending a funeral.