The glitches related to the Thieves Guild Hood have been reported before, but I think I found another one. When (spoiler) I became a Vampire Lord upon meeting Harkon in the Dawnguard DLC, and put on my Thieves Guild hood on, it removed the hair on the top of my female Breton's head. She's not completely bald, but it looks weird and glitchy. Next, I'm going to go to the face sculptor in the Ragged Flagon and see if that fixes it. I'm on 360, in case you were wondering. So, I can't get a mod to fix this glitch. Whenever I put that hood on, my Breton's hair goes away. She doesn't deserve to be bald!
Update: Going to the face scupltor does not fix this issue. The face scupltor won't remake your face if you're a vampire.

Interesting. Try to cure yourself from vampirism and see what happens.

I'll give that a try next. Its a weird glitch. I want my Breton to have hair. The hair glitch happens when you put the Thieves Guild Hood on. Just putting it on causes this glitch. My Breton's name is Sybille, not Britney Spears
Update: I bought a Black Soul Gem from Falion, and filled it, but he's still telling me to fill another one. So, I'm having to pay for the same thing twice. I don't mind, but that's one more thing I think should be fixed.
Update 2: Falion is curing my vampirism. I'll go back to the face sculptor after this and see what happens
Update 3: Curing my vapirism fixed this issue. Long story short, if you're a vampire, pretend the TG hood doesn't exist, and store it away in your house. At least, if you play on 360, and have Dawnguard.