This is actually pretty gosh-darned close to a period construction technique. From me – will wonders never cease?
It’s a related curve thing. Trust me. This trick also works when you’re sewing on the machine. (I use to sew upholstery. The only way to seam a straight to a curve in naugahyde is in three dimensions.)
Finish the other side seam and the straps.
Of course, I still need to make really tiny bias tape and bind the raw edges, and I need to add closures, but the basics are done. It goes together pretty quickly.
Fontanel, Béatrice. Support and Seduction: The History of Corsets and Bras. Trans. Willard Wood. New York: Abradale Press, 2001.
Vass, Lazlo, and Magda Molnar. Handmade Shoes for Men. Germany: Konemann, 1999.
Waugh, Norah. Corsets and Crinolines. 1954. New York: Theater Arts Books, 2000.