Off the top of my head those pattern pieces remind me of ones from Le Livret de la corsetière (pub. 1933).

This book was published in full on Wiki, but when I look at

http://fr.wikisource.org/wiki/Le_Livret_de_la_corseti%C3%A8re

I am not getting the links (and pictures) I'm expecting. Not sure if I'm looking on the wrong page or the pages have been taken down.

I've located an online copy of http://www.haabet.dk/Le_Livret_De_La_Corsetiere/

In the http://www.haabet.dk/Le_Livret_De_La_Corsetiere/51.html, there's a very similar corset
www.haabet.dk/Le_Livret_De_La_Corsetiere/I_Patron_a4Pieces.gif

I'm not sure what the difference between baleine and ressort is-- my French is nonexistent. Perhaps spiral boning rather than spring steel?
On the other hand, spiral boning may be an anachronism, for a teens era corset-- remember, Le Livret was published 15--20 later.

Apologies for including such a large graphic. It is, of course, wider than the margins.

yup ressorts are springs

Lovely pattern Jen!

Thanks for the pattern link! It's amazing how those same basic shapes stuck around for so long. This corset makes a really great foundation shape though - I could totally see it being worn with 30's dresses as well.

Interesting use of asymmetrical darts. However, I can't quite help wondering if the waist stay should be somewhat higher-- say three quarter inches.

in the last panel.