Yeah I have separate racial files. I admire my Bosmer file and if it won't let me use the hoods, then I'll just reload the save to where I haven't started the Dawnguard quest yet and choose another racial file to be a Vampire Lord.
Edit: Looks like the wiki is aware of the glitches.
Thieves's Guild Armor Set http://elderscrolls.wikia.com/wiki/Thieves_Guild_Armor
Linwe's Armor Set http://elderscrolls.wikia.com/wiki/Linwe's_Armor_Set
Guild Master's Armor Set http://elderscrolls.wikia.com/wiki/Guild_Master%27s_Armor_Set