Elizabeth’s Percentage System, nothing.
Kathleen Fasanella just posted pages from The Science of Gynametry by Mrs. M.V. Coleman, published in 1887. Instructions on drafting a (sewing) pattern based on a single body measurement: your wrist! When I have time, I’m going to try this out to see how it works with my body.
ETA: I started going through this very late last night. My text notes, on review, are indicative of the lateness of the hour, but I’m going to keep ‘em as is when I post them. For now, I’ll note that after deciphering half a page of instructions, despite her introductory claim, Mrs C did not derive every single dimension from the wrist measurement; she had to account for the variation in our relative amount of flesh, so she divided bodies into “classes” and “orders” based on back waist length and waist measurement. Ha!