Also, a technical caveat: the way helmet models work is a bit counterintuitive, since it looks as if the character's head is still underneath the helmet. This is only partly true - the visible parts of the head model are still there, but the stuff that isn't visible is more or less replaced with the helmet model. So if you were to attempt to remove helmets by simply making the helmet model completely transparent (which can be done by editing textures), you would indeed get rid of the helmet but your character would be missing the top & back of their head too. I'm guessing the "Show my helmet" option just takes the model data that's already loaded into cache for your character not wearing a helmet, and supplants whatever model data is currently in place with that.
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