If Prince Harry and Meghan Markle do attend King Charles' Coronation, there is a chance they may be dressed very differently to the rest of the Royal Family.
It's not yet known whether the Duke and Duchess of Sussex will be part of the 2,000-strong congregation at Westminster Abbey, but they have been given an official invite.
Despite being the grandchildren of the new King, it is believed that Archie and Lilibet have not been invited, with sources citing that the children are "very young".
Relations between the pair and the Royal Family are at an all-time low, the historic event awkwardly takes place on Prince Archie's birthday and there are rumoured to be a number of demands which need to be met.
If they do choose to attend, a royal expert claims the Sussexes have to provide their own Coronation finery and won't be given special robes to 'stand out' like some of the family.
According to author and historian Dr Tessa Dunlop, Harry and Meghan won't wear robes or a coronet, which is a small crown consisting of ornaments fixed on a metal ring.
She told the Mirror "Causing maximum angst is the vexed question of the Sussexes; will they attend the big day and if so in what capacity? Historical precedent doesn't bode well.
"After his own abdication and fall from grace Edward VIII attended neither the 1937 coronation of his brother George VI nor his niece Elizabeth's in 1953.
"However in our changed times with a father-King who wants both his sons by his side, expect to see Harry there but minus a coronet and robe.
"With the exception of Prince William, at this Coronation peers of the realm will not be paying homage to the new King so it is unlikely that Harry will have to go down on bended knee.
"Likewise if Meghan attends, any Coronation finery will be entirely her own. Expect very few to stand on ceremony for the Duchess of Sussex."
They will be in very different attire to the Prince and Princess of Wales, who are now the future King and Queen, and the other working royals.
Tessa added: "In contrast history suggests working royals will stand out.
"In 1953 the Queen's sister Princess Margaret had her own coronation gown designed by Norman Hartnell, embroidered with roses and daisies and offset with a stunning Cartier tiara.
"She travelled to the Abbey with the Queen Mother and they sat in a box overlooking proceedings with a four-year-old Prince Charles squashed between them.
"A similar scenario for the Princess of Wales and her three children is likely – William and his offspring are next in line to the throne and coronations deliberately emphasise the order of precedence and succession.
"Like it or not this state occasion is all about royal hierarchy. Visual messaging through both costume and carriage will remind us who the future King and Queen are (whether the Sussexes like it or not!)"
As heir to the throne, William will reportedly pay homage to his father the King during the ceremony, which will see him kneel and pledge allegiance to Charles as well as touching the crown and kissing the monarch's right cheek.
Harry famously wasn't allowed to wear military uniform for the late Queen's funeral last year - but was permitted to do so at a lying in state vigil.
It's believed that Harry will only come to the Coronation if he gets a face-to-face meeting with Charles and William to discuss their issues.
According to sources, Harry wants a summit with his father and brother - and will hope it goes better than the infamous Sandringham summit in January 2020
An insider told The Mirror: "Harry has been very clear and his position hasn't wavered – he isn't going to come if he feels the atmosphere will be as toxic as it was during the Queen’s Platinum Jubilee and funeral.
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"He's said he wants to reconcile with his family and it’s their call, but so far nothing has changed."
During an interview with Tom Bradby on ITV earlier this month, Harry was asked if he will come to the coronation if he is invited, and he said: "There's a lot that can happen between now and then.
"But, you know, the door is always open. The ball is in their court.
"There's a lot to be discussed and I really hope that they can - that they are willing to sit down and talk about it, because there's a lot that's happened in six years. And prior to that as well."
