http://www.uesp.net/wiki/Skyrim:Vampire_Hood#Vampire_Hood
#X B O X 3 6 0
#No I don't care if it's a black cowl. I want it anyways.
Sadly, I've never come across any kind of vampire hood. Maybe someone else has different luck.
Not this undead Dunmer... I've never seen it in any of the loot I've ever received since installing Dawnguard.
I'd be interested in this as well.