As the 19th century progressed women's dress gradually revealed the actual form of the body. In the 1820s and 1830s the waistline deepened, returning to its natural position. As the natural waist returned the bodice required a tighter fit and in contrast the skirt became fuller and bell-shaped. There were several different sleeve styles but short puffed sleeves were generally worn for evening and long sleeves for day. Corsets continued to be worn. These were lightly boned and quilted, with a deep busk. Several layers of petticoats with frilled hems, sometimes of horsehair, were worn to support the full skirts. Some petticoats of the 1840s were feather-quilted. Later examples of the 1850s and 1860s were made of 'crin' and steel hoops. The term 'crinoline' is derived from the French word crin which means horsehair.