I like the idea because I'm an unabashed fan of BBW's wrestling. So any match that involves two heavyset, or "thick" women is something that gets my heart pounding. There have been a few productions of women sumo, which you can find on Youtube. Frankly, I find most of these women just a bit too wide for my taste. There was a recent post here that featured co-ed teams comprised of fit, young people. One of the events was sumo wrestling, and the women involved did a great job. Very competitive! But not exactly what I look for.
Somewhere on the Internet you can find a video of Japanese women in sumo outfits trying to wrestle. All are slender, and the wrestling sucks. I never bought it. There was also a vid made by Bad Apple Productions that featured two, hefty women, topless in a ring, in sumo garb. In this 3 round "match" they barely touched each other. It sucked and I threw away the CD after only one viewing. Then there was the British movie entitled "Secret Society." It was about a bored, overweight housewife who joins a sumo club for women. I thought, "OK, this can't possibly let me down." Wrong again. The women in the movie spent all of their time talking, and in the "climatic scene" they end up wrestling a troop of Japanese men. This also survived one viewing before I tossed it.
Consequently, my collection of BBW's on the mat include productions made by Kontex, Ladyhawke, Crystal, and the occasional "find" on the Internet. IMO, Rockin-Roxanne's "Chubby Wrestling" section is still the best by far for finding this type of material.
