From altesses.eu/princes212.php.
This is an interesting dress! The striped part looks like it could be a cape made to fasten below her spectacular ruff. Her hair jewelry is also spectacular.
Keywords: Jacqueline de Bueil, comtesse de Moret, de Bueil family, du Bec Crispin family, Countess, French, mistress, Henri IV, frizzy coiffure, tiara, jeweled headdress, bun, partlet, vee décolletage, modesty piece, bodice, vee neckline, lace neckline ruff, lace bertha, cape, necklace, draped bodice ornament, earrings, brooch