First of all, I'm thrilled and awed at the same time that you drew Wilhelmine in a uniform inspired by Fiat Justitia, and would beg for a link, so I can link it with my story in turn!
Secondly: sorry, can't recall a Biche description that mentios fur collar. But chances are the Tagespiegel is right re: the painting showing Biche, because Wilhelmine did the same thing with Folichon at the Eremitage in Bayreuth (not just in the famous portrait with her which Fritz later used at the basic for the memorial statue; she also had Folichon included in a roof painting depicting the story of Chilonis in her audience room, see here.
Also, the sheer amount of female nudity in the concert room painting reminds me of my Dad during our recent Sanssouci visit eyeing all the female nudes and going "Are you sure he was gay?" Voltaire, who had no doubts in this regard, about Fritz' taste in interior decor as displayed at Sanssouci in the paintings: The subject was totally Priapian. Turtles billing, young men in the embraces of young women, nymphs beneath satyrs, cupids at lascivious sperts, people fainting with desire at beholding them, and rams and goats at similar pastimes. The supper was frequently seasononed with the same kind of philosophy; and any person who had heard the discourse, and looked at this picture, would have supposed they had caught the Seven Sages of Greece in a brothel.
Re: Fanart
Secondly: sorry, can't recall a Biche description that mentios fur collar. But chances are the Tagespiegel is right re: the painting showing Biche, because Wilhelmine did the same thing with Folichon at the Eremitage in Bayreuth (not just in the famous portrait with her which Fritz later used at the basic for the memorial statue; she also had Folichon included in a roof painting depicting the story of Chilonis in her audience room, see here.
Also, the sheer amount of female nudity in the concert room painting reminds me of my Dad during our recent Sanssouci visit eyeing all the female nudes and going "Are you sure he was gay?" Voltaire, who had no doubts in this regard, about Fritz' taste in interior decor as displayed at Sanssouci in the paintings: The subject was totally Priapian. Turtles billing, young men in the embraces of young women, nymphs beneath satyrs, cupids at lascivious sperts, people fainting with desire at beholding them, and rams and goats at similar pastimes. The supper was frequently seasononed with the same kind of philosophy; and any person who had heard the discourse, and looked at this picture, would have supposed they had caught the Seven Sages of Greece in a brothel.