Princess Mary wears a dress with a pronounced waist band and fairly complex sleeves suggesting the early 1900s. This is probably a contemporary colorization of Mary wearing the same dress as in the last two images.
Keywords: 1902, Queen Mary, Princess, Queen, Teck family, Windsor family, British, feathered hat, veil, high enclosing neckline, middle puffed tight sleeves, blouson bodice, lace, waist band, shallow vee waistline, close skirt, necklace, earrings, pin, jeweled bodice ornament, gloves, parasol