From Wikipedia; spots in background removed with Photoshop and image enlarged one fifth.
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This image shows the head and bodice of Catherine de Medici wearing one of the costliest dresses ever depicted. Even the ruff is jeweled.
Keywords: 1555, Bronzino, Catherine de Medici, Medici family, Valois family, French, Queen, curly coiffure, crescent neckline , neckline ruff, French hood, long puffed sleeves, false sleeves, fur, puffed cloth ornaments, vee waistline, farthingale, over-skirt, jeweled headdress, necklace, draped necklace, earrings, jeweled neckline, jeweled sleeves, jeweled bodice, jeweled skirt, jeweled bodice ornament, girdle, jeweled pendant chain, jeweled crucifix, fan