Mourners attending the state funeral of Queen Elizabeth II will have adhered to a strict funeral dress code, so says British etiquette bible Debrett's.
According to their website, they are an "unrivalled guide to protocol and modern manners, offering information about addressing royalty, people with titles and members of the professions, as well as advice on correspondence, rites of passage, business etiquette and international etiquette".
When it comes to dressing for state funerals, they say there is a strict dress code for those in attendance:
"Custom dictates that the Royal Family adheres to a strict dress code at state funerals. An all-black formal dress code is always respected."
"Ladies wear black knee-length dresses, or coats, black hats, and may also wear face-covering veils. Traditionally, gentlemen wear military attire, or black morning coats with medals."

The Princess of Wales, Kate Middleton, opted for a black coat dress as well as a black hat with a simple veil over her face.
She accessorised with the late Queen’s Japanese pearl choker necklace, the same one she wore to the Duke of Edinburgh’s funeral, which was not a state funeral.

The Duchess of Sussex, Meghan Markle, wore a similarly-shaped hat to Kate, along with a black dress with caped detailing from English fashion designer Stella McCartney.
She accessorised with a pair of pearl and diamond earrings that were gifted to her by the Queen ahead of their first solo outing in 2018.

The King and other royals including the Princess Royal, the Prince of Wales and the Earl of Wessex all wore military uniform.
The Duke of York and the Duke of Sussex, who are no longer working royals, wore suits to the ceremony.

The Queen Consort wore Queen Victoria’s Hesse Diamond Jubilee Brooch – diamonds in the shape of an open heart, with two sapphire pendants.
French President Emmanuel Macron was one of the many heads of state paying tribute to Queen Elizabeth II.

He wore a classic black suit for the occasion, with his wife Brigitte in an elegant black coat – the lining suggests it is by French fashion house Louis Vuitton.
She paired the coat with sheer black tights, leather gloves and a vintage-inspired pillar box hat with a small veil.

US President Joe Biden accessorised his black suit with an American flag pin, white handkerchief in his pocket and held his glasses in his hand.
He was accompanied by his wife Jill, who was in a black skirt suit with bejewelled buttons. Instead of a hat, she wore a simple black headband in a bow.

A handful of male attendants chose to wear hats to the funeral, with Business Secretary Jacob Rees-Mogg opting to wear a black top hat with his morning coat and grey pinstripe trousers.