I'd guestimate (if that's even a word) that a little more than half cosplay. But that's counting a recognizable and identifiable character or person from an anime, video game, or Japanese celebrity. As far as people wearing catears, foxtails, Japanese fashion, original characters, or other unique clothing (including Renaissance dresses and/or Pirate clothes) that easily bumps the number up to 75% or 80%. I know very rarely will I see someone not wearing anything interesting.