Thanks! It's very adjustable with the drawstring front and pinned flaps in the lining. I originally made it to fit over 1790s stays, but it works fine over these Regency ones that I patterned from those ones (mostly I just added bust gussets).

That's really interesting! Thanks for the info. I will keep that in mind when I eventually get to making 18th century stuff, which I am hoping to do next year.