The coat of arms which will eventually be used by the new Duchess of Sussex may very well use a similar arrangement as the arms of the current Duchess of Gloucester (pictured). That is to say that rather than her father’s arms impaled on the same shield with her husband’s arms a coat of arms granted to her in her own right will be placed on a smaller escutcheon placed over her husband’s coat of arms.

It was reported in “The Daily Mail” that the reason a coat of arms devised for her father to be used by her as well did not appear in the days before the royal wedding is that the Queen decided the process for justifying such a grant was “too complicated” and that it would be better to do what had been done in the case of the Danish-born Duchess of Gloucester. At the time of her marriage in 1972 her husband, Richard, was the previous Duke’s second son. His older brother, William, was killed 6 weeks after their July, 1972 wedding making Richard the heir to the Dukedom (which he inherited on the death of his father in 1974).
Birgitte, the current Duchess, with no ancestors of British origin, was granted a coat of arms of her own by Royal Warrant in July, 1973, about a year after she married Richard.
So, it is not hard to imagine that Meghan, the Duchess of Sussex will, similarly, be given a coat of arms of her own in due course and that it might very well be displayed on a smaller shield placed over her husband’s coat of arms. The precedent has been set for such action.
The story in “The Daily Mail” said, “Mr Markle will not have his own coat of arms,’ confirms a senior source at the College of Arms, which acts on behalf of the Crown in all matters of heraldry.
‘We were told it would be too ‘complicated’.
‘The Palace has instructed us to use the example of the Duchess of Gloucester and give Meghan Markle her own coat of arms instead.”
It will be interesting to see how this eventually works out but I’ll bet they do something similar for the Duchess of Sussex as was done for the Duchess of Gloucester who was also a non-armigerous foreigner who married into the Royal Family.