This last year I've been fortunate enough to find a few antique tailoring systems. Studying and cataloging them before I let them go to new homes has been one of my favorite between-work pleasures the last few busy months. For our study purposes, tailoring systems will include any drafting system that includes special rulers, charts, pantographs, expanding slopers, or skirt rules to draft a sewing pattern from a set of measurements.
Today for your pattern history lesson, I have The Morris Brothers French á La Mode Tailor System.
For more information on this sort of tailoring system, see the book Cutting a Fashionable Fit; Dressmaker's Drafting Systems in the United States by Claudia Kidwell.
Update: Due to popular request, this set is now available as a reproduction!