I think this is because, when you put gear on Azhara it shows ON her. So her customization ability is way higher than the others...
The crappy thing is her graphics is bugged. If you try to put the Orange Dancer outfit form the Sec. Key vendor, or the slave girl social outfit from nar shada on her, her skin is invisible. So only the outfit shows and nothing else.
I really wanted my Jedi Padawan slave to run around in the slave girl bikin, but nooooooooo.