interesting take on using hair for stealth mechanics, maybe the hair could change into different materials that could help the player in challenges like making hair sticky and move objects around with it.

Oooh a stealth game about hair, I never considered that! Maybe some objects can cut off the hair at a certain point so you have more freedom with level design? Picking up hair growth serum would help you grow it again. Maybe you can use the hair as a bridge too?