You should find another set of faction armor and equip/unequip it, that should work.
I think it also explains reputations dissapearing; pretty sure wearing faction armor
sets reputation to neutral, but not sure if this is the case for all factions.
okay, i tried it out and it worked!
took a little more fiddling around than i expected, though.
equipping/unequipping other faction armor brought back the reputation stats, but didn't clear the brotherhood costume (i used it to repair another set of armor while i was still wearing it). luckily i had an earlier save from before the repair so i just loaded that up, went through the steps, and it works fine now.
thanks!