By 1800, the old term “corps” had…

…disappeared entirely, and in France this new undergarment was called a “corset” (“corps” now being considered vulgar).  In England the old term “stays” was still used, although the English started to call them “corsets”.  Until about 1809, both terms were used interchangeably.

(Portrait:  “corsets or what?” A noble family with less than perfect figures in about 1808)