dethhend calls the original figure who came with this robe the 'devilman' (picture 2). I believe he is not far off the mark because the design of the robe does suggest a somewhat evil and cult presence. Unfortunately, it is through this piece that I realize a Lego head is slightly bigger than an Oxford one, because while the tan body came out of the robe easily, the head was stuck there for quite sometimes before I managed to pry it out using brute force.
The front of the robe has a faint flame pattern which isn't very obvious in the pictures. Somebody also mentioned it would make the perfect accessory for Emperor Palpatine.