Our Madewell Second Wave swim collection has a built-in feel-good factor—the fabric was made using recycled plastic (aka, this piece = three and a half water bottles). And the look-good factor is no joke either: Crafted from rainbow checked material, this shirred bikini top has a neckline that can be adjusted with the cinchable drawstring (the blouson effect is very South-of-France-in-the-'60s).