This is excerpted from a family portrait "Maximilian II of Bavaria with his family" in Wikimedia.
Marie wears a lace scarf that appears to cover her collar and a capelet that covers the bodice below it. Her dress appears to have pagoda sleeves with under-sleeves while her skirt has columns of moiré satin separated by thin lace (?) bands.
Keywords: Queen Marie Friederike of Bavaria, Princess, Queen, Hohenzollern family, Wittelsbach family, German, straight coiffure, bonnet, scarf, lace, lace, high neckline, collar, capelet, pagoda sleeves, long under-sleeves, crinoline