From royautes.centerblog.
Louise wears a braided bun in Wittelsbach style and a lingerie-like dress in this photo. She may be wearing a necklace largely tucked under her collar.
Keywords: Princess Louise d'Orléans, Orléans family, Wittlesbach family, Princess, German, straight coiffure, braided bun, high enclosing neckline, partlet, vee neckline, leg-o-mutton sleeves, pin, necklace