Ok your refereeing to Revan Redemption Robes. Don’t use this starting point it will never work for what you want. This uses the masked model ;)
There is already a mod out that will allow you to do this and have your characters head used.
This replaces the sf robes , or revans I can’t remember. the cape is actually still there just not visible . The alpha channel is used in this case to make the cape virtually disappear this also mean you can kiss the shiny metal good bye. We still at this point can not export models back to the game from 3d. So even if I did you all a big favor and chopped the cape off there is nothing I can do about getting it back to the game. The reason things are transparent is the alpha channel. Any thing black on the alpha channel is going to be transparent. Anything white is solid. The reason part of the skin are transparent is the alphas. The model I used has the mask in it. What is happening with you is you have not changed models so the mask and head are in the same place overlapping, one and other
I will not go in to an explanation about alpha channels. But I will refer you to some other posts of mine about it.
http://www.lucasforums.com/showthread.php?s=&threadid=126716)
this I wrote before making shader for this game however it is all correct
http://www.lucasforums.com/showthread.php?s=&threadid=126124)
What you are wanting to do has already been made from other moders here. I subject you try there it may be that your looking for.
My friend seps, robes
http://www.freewebs.com/seprithro/downloads.htm)
Monos robes
http://www.pcgamemods.com/5511/)
I hope this helps.
svцsh