The new line is in partnership with H&M. Eilish has already released collections with the likes of Urban Outfitters and Bershka. The pop superstar's range includes oversized t-shirts, sweaters and bucket hats. which are made entirely from sustainable materials. It's no secret that Eilish is an advocate for the environment. She's also teamed up with non-profit organization Reverb to make her upcoming 'Where Do We Go' world tour as green as possible. Eilish has created her own Eco-Village, which will feature refill stations for fans who bring their own reusable bottles while educating them on climate change.