Because according to the dev's adding any new feature to CC for the existing races is next to impossible. Realistically it's likely because they don't want to have resize the meshes for every item in the game to fit a new body. It's been a year and we still don't have even half the hats in the game for Viera or Hrothgar, and the ones that are in the game were done in the devs' free time of their own volition, so we already know it's not something they like to put their focus into.