From Laughing Moon Mercantile:
Underbust Corsets-_Views A and B are ladies' corsets and View C is a man's. View A is a ribbon corset. It is constructed of alternating pieces of fabric and ribbon. It has a busk in the front and lacing in the back. The bones are placed between two layers of fabric. This corset was popular from about 1899 to 1909. View B is a one layer corset girdle made with couti! with a busk in front, lacing in back, and boning tape. The dates for this corset are about 1900-1909. View C is a gentleman's corset made with coutil, a busk, lacing in back, and boning tape. Gentlemen wore corsets in the Victorian and Edwardian eras.