From Wikimedia.
Brocade cloth blazes from the openings of Margaret's (?) false sleeves while the ruff gives a small opening around the neck for ventilation.
Keywords: Marguerite of Savoy, Duchess, Italian, Habsburg family, Savoia family, tiara, hair jewelry, high neckline, neck ruff, lace, tabbed sleeves, hanging sleeves, false sleeves, carcanet, draped necklace, earrings, jeweled bodice, jeweled sleeves