Red wool corset, 1860s. Red wool became fashionable at the end of the 1850's and was used for petticoats, cage crinolines, & corsets. I assume this was for a large-busted woman, thus no front opening and the additional straps.
Dr. Warner's Sanitary Corset First advertised in 1875, this example is most likely from the late 1870s. A black sateen sanitary corset made by the Warner Bros. Corset Company. The sanitary corset was created by two brothers who were physicians, I. De Ver Warner and Lucien C. Warner when they became alarmed by the effects a badly fitting corset could have on the health of a woman.
c1775 stays: English, cotton and 162 pieces of whalebone, back lacing with center front sewn together. | c1760 panniers: English, four tiers of rattan hoops covered with striped linen. Lent by Martin Kamer. | 18th century shoes: wool canvaswork, high heels. Lent by the Brooklyn Museum. | From the catalog "Revolution in Fashion", Kyoto Costume Institute