This is a quite low quality cloak constructed from around three dozen assorted rib bones. They hang off of a cloak of incredibly low quality cotton which serves as the frame for the garment. They are stitched into the material in such a way as to make them clatter when the cape moves. If you wanted to look like a dark lord of the Sith, this would be a good place to start.
This is part of the bone armour set.
Two Piece Bonus: physical.control.force (12)
Three Piece Bonus: combat.unarmed.striking (16)
Four Piece Bonus: combat.melee.blunt (20)