It's an old long sleeved shirt that is turned into a skirt. It is useful for when you don't have a skirt that matches your outfit or you just don't have any at all and you have an old sweater that you don't wear anymore and you want to make use of it.
Looking for a way to make your Irma's look less baggy? Try a safety pin! It's fast, cheap, and easy! I've also seen the safety pin trick used to create different necklines and "quick hem" dresses! Its a super useful trick in the LuLaRoe styling arsenal!