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They are nation specific. You can either have a skin with a hood on, or put [Hooded] in front of your name and your identity should remain secret (unless someone knows your voice, smell etc). Getting in trouble for wearing a hood will depend on which nation you are in.

I mean OOC rules, like what you should and shouldn't do with hoods.

There isn't really anything. If you have one on your visual identity is hidden. You can pull of someone's hood or get close enough to see their face. You shouldn't use it as a form of contraceptive.