1) metal eyelets; 2) steel front busk of 1829; 3) 1832 Jean Werly from France took a patent on a type of woven corset made on a loom with gussets integrated into the weaving process. These were very comfortable, lightly boned, and very popular until 1889. In 1890, machine made corsets would gain more popularity than the Werly type.
(Extant: 1830 approximate gown and underpinnings)