From Wikimedia; shadows filled in and enlarged one quarter.
Here is the dress seen in this image being worn.
Keywords: 1555, Lopez, Catherine of Austria, Catalina de Austria, Catarina de Áustria, Catarina de Habsburgo, Catarina de Espanha, infanta de España, archiduquesa de Austria, rainha de Portugal regente de Portugal, Queen of Portugal, Habsburg family, Avis family, Princess, Queen, jeweled cap, jeweled ear muffs, ferroniere, earrings, slashed surcote, high enclosing neckline, ruff, buttons, elbow length full flared upper sleeves, long tight lower sleeves, rings, contrasting cuffs, close skirt, jeweled waist band, low vee waistline