Though it may create some 1-time incompatibilities, I think it would be a good idea to replace the "head" option for player/NPC outfit with "eyes", "mouth", "ears" and "facial hair". This would give players more options and control over the look of their characters and remove conflicting skin color between "base" and "head".
Anonymous
When wearing a mask "eyes", "ears", "mouth" and "facial hair" can be set to null, as I believe "hair" is.
But then you might get "faceless" players running around.