Naja’s “underwear with a purpose” just got a whole lot more purposeful. The social enterprise, which trains and employs single mothers in Colombia through its “Underwear for Hope” initiative, has launched a collection of colorful bras and knickers made with recycled plastic bottles. Sweat-wicking and antimicrobial, the undies offer vintage-inspired silhouettes (paging Taylor Swift!) and bold, kaleidoscopic patterns evocative of 1960s Pop Art and Mexican tile-work. Want something you can flaunt in mixed company? Naja also supplies swimsuits in the same planet-pandering material.