This is a very interesting topic, and as it has been pointed out, there are many different types of fighting styles, dress, and body type that people like to see.
Back in the good ole days....before the internet, aside from movie and tv catfights, the various catfight magazines and old 8 or 16mm films featured two nude or scantilly clad girls rolling over each other. It was extremely rare to find photos of two girls in an actual fight. Crystal was a pioneer in featuring "real" women in actual fights. I guess some people might say some of those girls were "trashy," depending on your point of view. But they weren't models; they were real girl-next-door women who agreed to meet and fight it out. And while there were many Crystal fights where the girls fought topless, and even some nude fights, many were also between girls who were clothed, and I found those fight more sexy in many ways.
It seems that the catfight fetish is a pretty big tent, and there's room for just about everyone.