I created a new Outfit list and if i populate the new list with existing clothing or armour the actor in game is wearing these items.

Now if i duplicate these items and use these in the outfit list, the actor appears naked. However when you access their inventory, it shows that they are equipped.

To clarify if my outfit list contains the following

ClothesNecromancerBoots
ClothesNecromancerRobes

Both original items, the actor displays these items.

If i then duplicate these
ClothesNecromancerBootsDUPLICATE001
ClotheNecromancerRobesDUPLICATE001

and use these in the outfit list instead, i change no settings on these items at all, these are no longer displayed by the actor.

I have looked through http://www.gamesas.com/topic/1381788-the-new-unofficial-creation-kit-bug-list/ but haven't seen any bugs relating to this.