From the Prado Web site.
Maria Polafox y Portocarrero wears a strap-sleeved dress with a separate bodice over a semi-sheer under-garment in this 1805 del Rivero portrait.
Keywords: 1805, del Rivero, Maria Tomasa Palafox y Portocarrero, duquesa de Medina Sidonia, Duchess of Medina Sidonia, Palafox y Portocarrero family, de Borja Álvarez de Toledo y Gonzaga family, Duchess, Spanish, straight coiffure, bangs, bun, chemise, U-neckline, quarter length tight sleeves, bodice, strap sleeves, waist band, Empire waistline, close skirt