By the time corsets were mass produced in the Victorian era..

.. there were MANY kinds, including nursing and maternity, sport, and health/reform.

(Photo:  Late 1860’s maternity corset had side laces so the bones were still aligned correctly.  Women could actually be in danger if they suddenly removed their corsets for pregnancy, because their organs and rib cage had been moved and/or altered in wearing a corset all their lives).