Head:
Hoods, helms, masks. And being able to combine them (to an extent), see my forum avatar for an example that has a mask and a hood.
Back:
Capes in varying styles, I believe this is already on radar but was not yet implemented in the CCT Beta.
Belts/leg accessories:
Tassets would be nice, not necessarily armoured ones, and ones that go in the front too (like you'd imagine a paladin/knight might wear)
I'm adding a picture from my character concept here because I don't know how to describe that flappy bit:
