This says the ripped skinny jeans have a button closure. Is there a zipper or all buttons?

With zipper and button combination.

What material are these destroyed butt lifting jeans made of?

73% Cotton, 25% Polyester, 2% Spandex, You will feel free in all positions when sitting or squatting.

How many pockets do these stretch jeans have?

Five functional pockets for carrying small items conveniently.

Is this size chart accurate?

Yes, Please make a purchase based on the size chart.

How do I wash these chic slim fit denim pants?

You can wash it on a gentle cycle in the washing machine then shape it and lay it flat to dry.