This is the unusual royal rule that Meghan Markle finds 'difficult to understand'

Members of the royal family are expected to follow certain royal rules - for example, this is when Prince George, Princess Charlotte and Prince Louis will have to start bowing to the Queen and all royals are forbidden from discussing politics.

There have been occasions when they have been given the green light to break royal protocol. The Queen allowed Kate Middleton to break the rules during a stay at Balmoral and approved baby Archie Harrison's untraditional name.

However, there's one rule that Meghan Markle (as well as all other female members of the royal family) must follow yet reportedly 'finds difficult to understand', and that is why women in the royal household are not permitted to wear trousers in front of the Queen. Instead, they must wear a skirt or dress while in the presence of the monarch, and the former Suits star isn't quite sure why.

A source recently told People: 'She has found certain rules in the royal household difficult to understand, like the fact that the queen prefers women in dresses or skirts rather than trouser suits, and is often asking Harry why things have to be done in a certain way.

'I think she finds it a little frustrating at times, but this is her new life, and she has to deal with it.'

The Queen has some very strict dress code rules which the royal family are expected to adhere to - how can we forget the time that Meghan was slated for daring to wear dark nail varnish (eye roll).

The monarch even has her preferences when it comes to facial hair, apparently. Prince Harry, however, has managed to get away with having a beard unlike his clean-shaven brother, Prince William, and father, Prince Charles.

It looks like the Sussexes are definitely shaking things up in the royal household.