Her Wikipedia article is here. An image of her sister Elisabeth is here.
Catherine wears a dark sleeveless overcoat and a gold brocade dress below it. Her sleeves are decorated with numerous puffed cloth ornaments.
Keywords: 1557, Monogrammist PF, Queen Catherine of Poland, Habsburg family, Jagiellonowie family, Archduchess, Queen, jeweled cap, hood, high enclosing neckline, ruff, partlet, square neckline, French sleeves, puffed cloth ornaments, cuffs, full skirt, overcoat, no sleeves, carcanet necklace, necklace