In England from the 17th century forward…

…the word “corset” can be found, but it is always used in plural “corsets”.  France kept the old term “corps” until about the year 1800, after which the term “corset” (never “corsets”) was used.

(Photo: Early 1600’s Tudor CORSETS originating from the French term ‘Corps’ or ‘Body’.  Term used commonly for the first time in history, it kept the “s” on the end for plural until around 1800).