The outfits worn by the Royal Family have fascinated many – from the Queen’s rainbow coats to the Duchess of Cambridge’s tiaras.

But fans of the royals will have noticed that they have never seen Prince George in a Spiderman T-shirt or Catherine in a tracksuit.

There are etiquette rules governing what members of the Royal Family wear to public engagements – from gloves, to military uniforms, and skirts instead of jeans.

Here we reveal the dress code the royals aim to follow.

When the Queen will wear a hat

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The Queen has become known for her bright and bold hats which she is often pictured wearing while performing official engagements.

Dress code etiquette states that women wear hats for formal events, says Diana Mather, a senior tutor for The English Manner etiquette consultancy.

“Up until the 1950s ladies were very seldom seen without a hat as it was not considered ‘the thing’ for ladies to show their hair in public.

“But all that has changed and hats are now reserved for more formal occasions.”

One of the Queen’s hats became a hot topic on social media when she officially opened Parliament last month.