Hibiki did something like this before, though it was based on characters rather than the person behind the screen. For myself I’d say.
Mask: A rather plain white mask that covers one side of the face, though a darker color would likely be better.
Body: Long black coat, like that a conductor might wear.
Gloves: also plain, thick, white or black gloves, nothing overly complicated, merely functional.
Shoes: short, black dress-shoes, likely going to about the ankles. Least practical part of this ensemble.
While the code name of course depends on one’s companions I would like to be called “ghostâ€