Haruka Funakubo is the world's foremost hara-zutsumi specialist. She is so good at it that she has a special variation that she does which is known colloquially in Japan as "Funakubo-Gatame". The hara-zutsumi technique is referred to in the USA as the "Gut Wrench" and it involves using uke's jacket skirt to gain leverage to roll uke over.
(Video clip courtesy of IJF)