Pattern for a ribbon corset. After 1900.
pattern by festive attyre, Pattern and tutorial for 1910's era corset
1889 Patent US397801 - CORSET-WAIST - Google Patents
1898 corset pattern for your smallest ideal corset without tight lacing. From here: http://www.staylace.com/gallery/gallery07/index.html Note that the commentary on the website is of dubious accuracy.
1868 Lavinia Foy Patent US79647 - IMPROVEMENT IN CORSETS - Google Patents