From bjws.blogspot.com/2012/02/little-more-on-starch-for-ruffs-et-al.
This is a "generic" aristocratic Lady's saya from a French viewpoint. The reason for including this is the crease line about 3/4 of the way down the center front of the skirt that tapers to maybe 30 cm above the hem at the edge of the skirt to the left in the image. I first noted it in the ca. 1586 portrait of Isabel Clara Eugenia with Magdalena Ruiz by the Coello studio. This generic dress casts a conspicuous shadow on the floor while the shadow is much less conspicuous in the ca. 1586 Isabel Clara Eugenia with Magdalena Ruiz portrait. I can only guess that this was a folded length of fabric that could be rapidly changed to adjust the skirt length.
Keywords: Spanish, curly coiffure, tiara, high enclosing neckline, neck ruff, lace, tabbed sleeves, hanging sleeves, lining, false sleeves, cuffs, girdle, tabbed bodice, vee waistline, farthingale, maxi-length skirt, cacanet necklace, necklace, jeweled bodice, aglets, handkerchief, saya