The Diabolist hood's texturing issues have been noted elsewhere on the forums, but not submitted as a formal bug in this section. The top metallic-y texture area on the top of the hood has an odd, skunk stripe-ish repeating version of itself on the back of the head that is stretched and abnormally shaped:
It seems that the the top metallic texture is erroneously repeating itself on the back.
Additionally, the hood also clips pretty badly with a character's head when running while your weapon is drawn.
As this is a paid Cartel Market item, the numerous posts and concerns about these appearance bugs across the forums should be addressed in some fashion. Developer response / attention to this would be really appreciated.