According to Christie's overview, she poses as Flora in a red and gold silk dress.
From the lost gallery's photostream on flickr; linear clusters of spots along the left edge of the image removed with Photoshop by gogm.
Mme. Phalaris is luxuriously dressed with diamond hair jewelry, abundant lace, and a sumptuous over-dress and wrap in this de Largillière portrait.
Keywords: de Largillière, Marie Thérèse Blonel d’Haraucourt, Madame Phalaris, duchesse de Phalaris, duchesse de Falary, Duchess, French, mistress, Philippe II d'Orléans, long straight coiffure, hair jewelry, chemise, trapezoidal neckline, lace, cuffs, criss-cross bodice, elbow length full over-sleeves, jeweled waist band, natural waistline, close skirt, clasps, wrap