Her Wikipedia article is here.
From Wikimedia.
I have been aware of this portrait for years, but the dress strikes me as being ugly. Her otherwise undistinguished saya has a very wide collar decorated with what appears to be sophisticated lace. Sophisticated lace is associated with the end of ruffs and farthingales - a ruff is not the best way to display expanses of new beautiful laces.
Keywords: Loves, Maria Caterina Farnese, Farnese family, d'Este family, Duchess, Italian, jeweled feathered hat, high neckline, collar, lace, tabbed sleeves, hanging sleeves, false sleeves, back-flared cuffs, basque waistline, farthingale, necklace, brooch, jeweled bodice ornament, jeweled bodice, jeweled skirt, jeweled sleeves, gloves, saya