From Wikimedia; I removed spots in the background with Photoshop and made the image lighter.
Pourbis' workshop apparently has a business of preparing portraits of Infanta Isabel Clara Eugenia. Her over-dress resembles a jacket.
Keywords: Pourbus the Younger, Infanta Isabel Clara Eugenia, Princess, Spanish, Habsburg family, curly coiffure, high enclosing neckline, neck ruff, lace, jeweled headdress, framing headdress, over-dress, lapels, tabbed sleeves, hanging sleeves, slashed sleeves, false sleeves, cuffs, under-dress, girdle, vee waistline, full skirt, farthingale, draped necklace, earrings, jeweled crucifix, vee waistline, gloves, saya