Depending upon the context, it might mean that the princess was out in public "incognito"; that is, without her obviating designation of authority, her diadem.
Or she might have just been comfortably hanging around the palace, not intending to entertain guests.
A crown or tiara.
I am wearing a diadem.
The diadem was one of Tom Riddle's Horcruxes. A diadem is like a sort of crown.
Diadem of gold or precious stones.The queen wore diadem of jewels and gold
Operation Diadem happened in 1944.
A diadem is a jeweled crown worn as a symbol of sovereignty. The diadem in the Harry Potter books is Rowena Ravenclaw's and it was believed that it bestowed apon the wearer incredible wit. It was stolen by her daughter a long time ago and was lost. This is why the diadem is refered to as "the lost diadem of Ravenclaw" In the last part of the book, Harry and his friends believe it is a horcrux and contains a piece of Lord Voldemorts soul. Voldemort cannot die without all the horcruxes being destroyed so therefore, Harry needs to destroy the diadem. The only problem is that it is lost.
how do i know ask some one else
If you mean her symbols, then the pomegranate, the peacock feather and the diadem.
She adorned her head with a sparkling diadem for the royal ball.
A zodiac diadem is an ASTROLOGICAL CROWN. or something very similar to that.
Madonna with the Blue Diadem was created in 1511.
Mograbin diadem snake was created in 1923.