From interest.com/chat0696/royal-fashion-styles/.
I cannot tell if she is wearing real metal armor - probably not. La grande Mademoiselle appears to relish wearing feathers and costumes.
Keywords: Anne Marie Louise d'Orléans, la grande Mademoiselle, Duchesse de Montpensier, Princess, French, Bourbon family, Fronde, curly coiffure, feathered headdress, off shoulder scoop neckline, chemise, modesty piece, lace, elbow length flared under-sleeves, bows, cuffs, bodice, elbow length flared over-sleeves, cuirasse, quarter length close sleeves, vee waistline, full skirt, necklace, earrings, jeweled bodice ornament, theatrical dress