From pinterest.com/louis_or/decadencia-española/; enlarged by hals and veiling reflection on the right side of the image was partially removed with Photoshop.
This is generic late-century Spanish upper-class dress with straight coiffure drooped to one side, long wavy falls of hair, a very low straight neckline edged with a bertha, flaring panels of decoration of the bodice, lower-puffed sleeves with lace cuffs, a somewhat full skirt, and luxurious material.
Keywords: Spanish, long straight coiffure, feathered headdress, fitted bodice, off shoulder straight neckline, lace bertha, brooch, elbow length tight upper sleeves, long puffed lower sleeves, lace back-flared cuffs, sleeve ornament, bracelets, full skirt, folding feather fan