http://www.dressing-history.co.uk/pages/images/3428162.jpg
The fashion plate above, dated as 1837, shows a lady in a corset. Does
anybody have any idea what it is that fastens her corset at the front, as
there is obviously something there, but metal corset busks were not, I
believe it is
Metal split/2-part corset busks were invented in 1829 by a French corsetier,
so it's certainly possible, even though they weren't immediately widespread.
Being a fashion plate, this would likely show the most avant garde features!
The loop post type of fastening for the metal 2-part corset