Answer:
I twist and turn and leave a loop. What am I?
I am just two and two. I am hot. I am cold. I am the parent of numbers that cannot be told. I am a gift beyond measure, a matter of course. What am I?
I take off my clothes when you put on your clothes. I put on my clothes when you take off your clothes
I am lighter than the material I am made of. You see parts of me but more of me is hidden underneath.
I have a strong affection for belly buttons.
No matter how little or how much you use me, you change me every month.