No apologies needed, some in Britain continue to get it wrong too. For clarity, the correct address to/when referring to the King or/and Queen is His/Her, Your/Their, Majesty/Majesties.
Before his ascent to the throne, His Majesty was always known as the Duke of Rothesay in Scotland, rather than Prince of Wales. The background to the title is in
this paper (which needs updating).
HM is ‘permitted’ to wear whatever he wants. What he has worn is:
Balmoral
Duke of Rothesay
Duke of Rothesay Hunting (simplified setting)
Gordon Highlanders
Government (Black Watch)
King George VI
Lord of the Isles
Stewart, Dress
Stewart, Hunting
Stewart, Old
Stewart, Royal
Stuart, Prince Charles Edward
His Majesty worn the Duke of Rothesay shortly after he became King but whether he will continue to wear it and Lord of the Isles tartans now that both titles have passed to his heir, Prince William, remains to be seen
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