In my previous post I looked at a possible portrait of Sibylla of Cleves and her son, which has been copied and also called Sophia of Mecklenberg. So that lead me down another series of mixed identities that has a little bearing on 

Sophia of Pomerania, later Duchess of Mecklenberg

Her headdress has many features of a stickelsche, and the painting is most definitely posthumous as it looks more like the middle of the 16thC. 

And then the other Sophia of Mecklenberg, of 1481–1503, also has a similar but not identical kind of wide supported headdress.

This headdress may be why a portrait of her in England was attributed as Sibylla of Cleves.

So far so interesting, however K. Barich has found her also in the Cranach illustrated Stammbuch as Margaret von Anhalt (1494-1521) as the second wife of Johan, after Sophia.

Das Sächsische Stammbuch – Mscr.Dresd.R.3
Erscheinungsort[S.l.]Erscheinungsdatum1546SignaturMscr.Dresd.R.3

• 

• 

So far so interesting but it does suggest the headdress is in fact Saxon. Which is also similar to the shape in this portrait of an unmarried girl by Lucas Cranach with the same general shape and the letter H again.

All of which means being careful with copies and even with attributing original works as sometimes personal taste in clothing can transcend regional fashions. This is certainly true of much of the history of dress.