So I have a battle-mage style character & for almost the whole time she had a heavy armor set/mage hood combo. I just now got a set of daedric with the atronach forge & now I kind of want to upgrade from my adept hood to an expert or master hood but I cant seem to find any better ones. I know this is a small problem but I would still like some help on where to find one. I really want to keep the armor/hood look.
edit: & yes, I've looked in the college, none of them are selling any

They might be leveled but have you checked with the various instructors at the college of winterhold? For my 50+ they always have a few master hoods.

Are you a master mage? i think That the higher the level the higher the mage robes maybe. Or just try the Wiki.

I've never seen anything better than an Adept hood. I don't think the Expert / Master robes come with a hood, sorry!
But you could always enchant the default mage hood. I know there's a non-enchanted variant to be found somewhere, but I can't remember where.

There aren't any. Collete Marence may sell unenchanted hoods you can enchant yourself, otherwise it's circlet, hat or helm.

The thieves which are found on the roads have the unenchanted hood but it is the same colour as the novice hood.