She married Prince Ruprecht of Bavaria after his first wife, Marie Gabrielle, died in 1912. Her Wikipedia article is here.
Posted to the Alexander Palace Time Machine Discussion Forum by KarlandZita on 25 March 2009.
Princess Antonta's dress has a gauzy over-bodice with a vee neckline over a bodice with an off-should garment beneath and a vest above.
Keywords: Antonia of Luxembourg, Princess, Grand Duchess, Nassau-Weilburg family, Wittelsbach family, Luxembourgois, straight coiffure, trapezoidal neckline, modesty piece, elbow length notched close sleeves, over hanging bodice, waist band, natural waistline, over-skirt, close skirt, necklace, brooch