As far as costumes go, I think the only real important feature is the effort that they put into them. I respect people that really put their time into their costume and make them look as authentic as possible. A friend of mine and his college buddies actually cosplayed as Organization XIII, and I thought it was really good. My Buddy (Xaldin) put a lot of effort into his costume. He got hair extentions, grew out his sideburns, and did a lot of costume work for everyone.