singer in a novel by George du Maurier who was under the control of the hypnotist Svengali

Trilby, a gothic horror novel by George du Maurier published in 1894 was one of the most popular novels of its time, perhaps the second best selling novel of the Fin-de-Siecle period. It is set in the 1850s in an idyllic bohemian Paris. Though it features the hijinks of three lovable English artists—especially the delicate genius Little Billee—its most memorable character is Svengali, a Jewish rogue, a masterful musician, and an irresistible hypnotist.

Trilby is a Fantastic ballet in 2 Acts-3 Scenes, with choreography by Marius Petipa and music by Yuli Gerber. Libretto by Marius Petipa, based on the 1822 novel Trilby, ou le lutin d'Argail by Charles Nodier.

felt hat with a creased crown

A trilby or trilby hat is a soft felt men's hat with a narrow brim and a deeply indented crown. It is traditionally made from rabbit fur felt, but may also be made of other materials such as tweed.