A recoloured version of the Baron Samedi outfit. Pieces are available as a random item from the Halloween 2014 mission reward/item shop bags.
Items are not bound until used so they might be on the auction house after Halloween. Can be found on the auction house as “Samedi Shoes, faction colored” etc. When placed in the dressing room, the names will change to Baron for males, Baroness for females and green for Dragon faction.
Thank you Chosen-Blood for the screenshots!