The hat part of the skin is just a slightly bigger block that goes around the head block. It's just to make nicer looking hats and things by having multiple layers, it isn't like an item you can just remove at will, if it's a part of your skin, then it's a part of your skin, and you can only get rid of it by editing the skin.
As far as I'm aware anyways.
How do I toggle the Helmet skin on and off? It starts my character with his helmet on.
Herobrine exists because we let him exist.
Herobrine exists because we let him exist.
Herobrine exists because we let him exist.
As far as I'm aware anyways.