Kate Middleton and Prince William, Meghan Markle and Prince Harry were among the British royalty to attend Queen Elizabeth’s pre-Christmas lunch at Buckingham Palace last Wednesday.

Even though there were no media photographers present for the private occasion, Middleton dressed in amiable pink while Markle sported festive diamond earrings.

The dress code provides tips for daily style etiquette.

Here, we look at how four fashion power figures from Melania Trump to Anna Wintour prepared for meeting royalty.

14 of Melania Trump’s most expensive looks

Keira Knightley was awarded an Order of the British Empire (OBE) from Prince Charles at Buckingham Palace earlier this month. The British actress wore a tweed suit from Chanel’s haute couture spring 2017 collection.

US first lady Melania Trump accompanied her husband, President Donald Trump, to Windsor Castle for tea with Queen Elizabeth in July.

Melania changed the bright geometric-patterned dress by Victoria Beckham she had worn earlier in the day for a neutral minimalist ensemble by Christian Dior.

She dressed up the blazer and skirt combo with a slim black belt and pink Christian Louboutin pumps.

Charlotte Tilbury, founder of her eponymous brand of make-up, bowed to the queen while wearing a fabulous black cocktail dress by English designer Alice Temperley.

We review Charlotte Tilbury Christmas make-up collection

The hat is from Victoria Grant, the milliner who created writer Sophie Moss’s gorgeous fascinator to Prince Harry and Meghan Markle’s royal wedding.

Anna Wintour, editor-in-chief of American Vogue magazine, chose a belted pink coat-dress from Chanel with nude Manolo Blahnik Umice criss-cross pumps to receive her DBE (Dame Commander of the Order of the British Empire) in May 2017.

So our observation is do not clash with the queen’s favourite bold hues. It’s not the time to wear your black and white — go for a classic look.

Want more stories like this? Sign up here. Follow STYLE on Facebook, Instagram and Twitter