This Diary of a Renaissance Seamstress site and page has what looks like quite a few pretty serious free patterns for historical costumes! Some look a bit more authentic than costumes, including the corsets! I haven’t looked at every link, but I can tell you the corset download has 6 beautiful corsets (from another site) in PDF files you’d want a plotter to print out rather than tiling together from letter sized pages. You can do it at Staples from a post I once wrote.

Can’t wait to check out more!