Robe de Style, Jeanne Lanvin: ca. shot silk embellished with tamboured roses and other flowers, the tiers trimmed with floral lappets. When zooming in, it's clear that the skirt is gathered level, and the dropped front point is simply laid over the skirt.
notice the yoke around the waist of the petticoat. Period Corsets® Epitomize eighteenth century ostentation wearing an embroidered c. 1770 Judith corset, Full Pannier, Eighteenth Century Petticoat, and Chemise with lace trim.