Riddle: You always use me every day. You never notice me every day. If you hit me it would do nothing. Without me the whole world would go upside down. What Am I?
Answer: Oxygen! You always use oxygen every minute and day. It's invisible. You would do nothing to oxygen except breathe it in. Everybody would die without it.
Riddle: I'm always on you. Sometimes I am not. Without me you would be embarrassed or scared. I am any color you pick. What Am I?
Answer: Your Clothes! Clothes are almost all the time on you. Clothes are not on you in the bathroom. In public you would try and hide without them. Any colored shirt.