It'll be hard to do the scythe, so don't do that part
But I want him wearing a cloak that covers all but his face, his face is a skull
Wait... do you want an enderman in a cloak? Or do you simply want a Grim Reaper skin? I assumed you wanted the enderman skin with a cloak, but when you said that his face his skull... well it threh me off a bit xD.
Basically my question is, do you want this skin:
There is a hood, but since the enderman is all black, the hood is very hard to see.