FTP, name this novel by Theophile Gautier.
One character in this work writes confidential letters to her friend Graciosa, and the protagonist writes similar letters to his friend Silvio.  One character refuses to play Rosalind in an amateur production of the protagonist's favorite play, As You Like It.  After a riding accident, the page Isnabel is revealed to be a woman, causing that character to be jealous of her and her perceived affair with her master.  After de C takes him around town to look for a lover, the protagonist pursues and wins Rosette.  In the end, Monsieur d'Albert experiences perfect love with Theodore de Serannes, who is actually the cross-dressing title character.  FTP, name this novel by Theophile Gautier.
One character in this work writes confidential letters to her friend Graciosa, and the protagonist writes similar letters to his friend Silvio.  
Mademoiselle de Maupin