Fetish readers may have already heard of Cathie Jung, but I hadn't:

Of course, Ethel Granger and Cathie Jung are among the best known corset wearers of contemporary corset history. Both ladies appear in the Guinness Book of World Records. You can find Cathie on the website of Guinness Books of World Records under Human Body/Smallest waist on a living person. The entries state Ethel's corseted waist of 13 inch (33 cm) and Cathie's 15 inch (38 cm) but in a way, Cathie has beaten Ethel...

Includes a brief but fascinating FAQ on just how to get a waist down to this size. The things people do to themselves, I tell ya.

Via Reflections in D Minor.