Spun off from this answer: My housecarls won't stay dressed!
Apparently, certain characters will just outright refuse to keep on any clothes that don't meet their particular preference. For some it might be Heavy Armor, for some it might be Light Armor, and I'm sure others prefer robes or plain clothes.
Is there a way (maybe a list I haven't found yet?) to determine who would like to wear what, before giving them any items?
Also, all the housecarls I've had so far seem to come standard with Steel Armor. Does this mean they all prefer Heavy Armor?