Well, there were a few things I wanted to add to the chest piece and a few other things I wanted to edit. I used both the in game and live action version for references so it's sort of a mixture of both. XD haha
I think it looks pretty good.
PLEASE NOTE: The pieces on the back should be used as a template so that you can cut something else out to give it the layered look like the actual version. I also recommend looking at a picture of how the back looks so that you can properly create the little layered piece at the bottom.
Also, the seperate pieces at the top on the neck collar area are made to be "sunken in" to the collar and the piece on the very front of the chest piece should not be sunken in. A piece of carboard might be too thick for that piece, but that is just my opinion.

hehe
Well, here is the new chest piece. Originally by TheDigitalFix, just edited by me A LOT! haha It is NOT yet unfolded, but is already prepped for a smooth unfold.
http://www.4shared.com/file/4Wa-4O4i/Kat_Torso_NeckCollar.html
EDIT: Okay, so I got around to unfolding it. Helmets and chest pieces are the only 2 types of models that I hate unfolding. XD They take forever. Mostly because when I unfold, I try to make sure that it is pep friendly.
http://www.4shared.com/file/4uthGZ6Y/Kat_Torso_NeckCollar_Unfold.html
Enjoy.