First of all, Spanx for underneath. All black, in that fabric which stretches a lot, but always goes back.
Using silver sequins, I would make a big throwing star across the chest.
The top would be long sleeved.
I would have silver serpent bands on each upper arm.
I would wear a red snood for a mask.
On each hip there would be silver serpents attached which are coiled just right to be gun holsters.
I would have a black cape, but I would only wear it when it is cold.