From joaquin-sorolla.blogspot.com/2009/07/retrato-de-la-sra-zaldo.
While I can find nothing about a Sra. Zaldo, I can say this is a wonderful example of mid-1890s evening dress with an hourglass figure, leg-o-mutton sleeves, and copious frills on her bodice.
Keywords: Sorolla y Bástida, Señora Zaldo, bouffant coiffure, knotted bun, neck band, square neckline, bertha, elbow length leg-o-mutton flared sleeves, natural waistline, close skirt, flounces, maxi-length skirt, gloves, shoes, earrings