Clear and defined rules on Disguises.

[Vriska]

We do need to note that if a character doesn't have an active disguise, they're not disguised. Additionally, if they attend a battle it's public information to those who attended and could recognize them.

For disguises themselves, they do need to have some kind of hint/way of recognizing the person behind the mask, and they need to be physical objects to hide someone's face (masks, hoods, etc.)