Plump and young lady taking the fresh air in the morning: she is dressed in a "flourishing tail" or "rounded rump" Polonaise* with very expansive wings, the whole trimmed with wide bands of gathered linen. These polonaises, much more ample than the others, perfectly suit people whom nature has given a nice roundness or whose pregnancy will soon show.
Galerie des Modes, 21e Cahier, 4e Figure Young Lady coiffed with an English hat called a chapeau à la Turque, trimmed with flowers and gauze; she is dressed in a Polonaise of gauze striped with silver on a ground of pink taffeta, as is the petticoat. (1779)
A Most Beguiling Accomplishment: Galerie des Modes, 9e Cahier, 5e Figure (1778). Caption & long description translated by @Cassidy. "Elegant bourgeoise walking in the Country, dressed in a morning Polonaise with a Cap in the new taste... The Mantelet is a type of little overcoat or light drapery, intended to cover the upper part of the body; it is kept out of the formal parure, but it has become so favored that one is accustomed to see it as an essential part of Ladies' clothing. Taffeta…
Galerie des Modes, 16e Cahier, 5e Figure Young Lady in a Polonaise of indienne, trimmed with gauze, and coiffed with an English hat trimmed with flowers and a black lace. She holds a bichon under her arm. (1778)