The Duchess of Cambridge Kate Middleton cannot travel, even interstate, without an entirely black outfit in her luggage.
In fact, no one in her family can.
The reason is simple: because what if someone dies.
If the Queen died, for example, they all must show respect be wearing the colour of mourning. It would be unthinkable for any member of the Royal family to leave the house in colour following the loss of the Queen.
When Diana and Charles were on a skiing trip to the Alps, Diana’s father died and the family all had black clothing packed for the flight back to England.
In the past, some Royals haven’t been so prepared. When the Queen’s father died, she was on safari in Kenya with her husband Philip, and no one was allowed to photograph the pair until they were dressed entirely in black.