maybe someone else on here has an idea, but i don't think it's really possible to shrink a swimsuit...lycra, nylon, spandex, all those fun synthetic materials just aren't shrinkable. i think if you were to try to shrink it like you would a pair of jeans or cotton t-shirt, it would, if anything, start to lose its color and/or elasticity properties. maybe i'm wrong though, maybe someone does have ideas.