So my FinFun monofin doesn't fit anymore because the fabric is stretched, so I wanted to shrink my skin that goes with it and give it as a gift to my boyfriends 6 year old niece. But obviously it needs to be a bit smaller to fit her. It's 82% polyester and 18% spandex, would putting it in the dryer shrink it enough? And if it got wet would it go back to its original size?