She was born in 1591 so this is a 15 year-old girl who married two years later
Image from Wikimedia posted to replace one originally posted on 11 June 2017 and removed due to uncertainty about identity. Also posted to her new Subalbum.
Isabella is wearing something that looks like an embroidered chemise or under-garment. She also wears a large carcanet necklace.
Keywords: 1606, Pourbus - Frans the Younger, Isabella di Savoia, Savoia family, Este family, Duchess, Italian, wavy coiffure, tiara, hair ornament, earrings, necklace, under-bodice, high vee neckline, tabbed basque bodice, lace-edged neckline ruff, collar, carcanet necklace, jeweled pendant, tabbed hanging sleeves, clasps, lining, long false sleeves, lace back-flared cuffs, full skirt, saya