I wouldn't do nude fighting, coz frankly I don't see the point. U already only wearing a short and sometimes shoes (and a sports bra for the girls). Taking ur shorts off won't benefit u in anyway. And I am not talking about doing it competitively, even if u do it just to stay in shape I still can't see the advantage. If u wanna do nude sports may I suggest swimming a few laps nude in the pool or walking/running/hiking or if u r lucky to have access to one, a nude gym. But that's my opinion.