From Wikimedia.
This portrait can be regarded as a close up from the half length portrait seen in the last image. Her partlet is made of delicate lace work and her over-bodice is adorned with pearls.
Keywords: 1560, Bronzino, straight coiffure, jeweled headdress, high enclosing neckline, partlet, square neckline, modesty piece, jacket, collar, lining, long tapered sleeves, cuffs, necklace, earrings, jeweled jacket, handkerchief