Not just a dusty, craftsy relic of the hippie era, the ancient art of tie-dye has been used by practically every traditional culture to pimp out their clothes and make what would otherwise be snoozy swathes of cloth a little more interesting. This morning, the Proenza Schouler boys appeared on Martha Stewart to share a few tricks of the technique. Martha showed them how to use eco-friendly spray paint, but the boys’ own tropical blue tank top for spring is our fave, available for a limited time on ProenzaSchouler.com (shipping May 15). $275 seems a little steep, but each piece is unique, and will probably hold up a lot better than the street-vendor variety. And it’ll look great this summer with your new hookah and silver-bleached dreads.