From the pictures I've seen, the new belt/loin cloth piece seems to match Jitsu's color scheme just a wee bit better. Plus, In spite of his all-black uniform, Ninjor actually has quite a lot of detailing going on, and the loin cloth just makes it all a little too busy for my eye. Jitsu, on the other hand, isn't heavy on details. I think it spruces up Jitsu, but weighs Ninjor down. There's also no way a ninja is going to wear that piece, with all of its dangling ropes and whatnot! It would get in the way too easily!