I have the american girl version of this in size L purchased just before Felicity was archived. I've had it for almost 3 years and after multiple washings it still hasn't pilled at all. It seems to be made of the same material as Felicity's shift. It is rather thin, but I just wear white dance shorts underneath it and it looks just fine. I have gotten a lot of wear out of it and it's a beautiful nightgown!