How to set armor to non standard biped parts?

[magnemoe]

I'm trying to set an mask to use something else than the circlet slot but then it don't show.

In short any other slot make it fails to show up, have had some luck with hoods, mostly as you can have them hide and show hair and ears but nothing else.

 

Any tips here? Do I have to edit the mesh object also?

Also thinking of making the Khajiit earrings seperate objcts, but run into simlar problems.