From Wikimedia.
This is a copy of the Gobert work seen in the previous image that shows the detailing of the Duchesse du Maine's cuirasse (called a "half-bodice" below) and other parts of her dress.
Keywords: 1690, Gobert, Duchesse du Maine, Duchess, Bourbon family, French, straight coiffure, hair jewelry, vee neckline, modesty piece, chemise, elbow length puffed sleeves, cuffs, lace, cuffs, half bodice, girdle, vee waistline, full skirt, jeweled bodice, jeweled arm bands, clasp, robes