Billie Eilish brought her signature grunge style to the Overheated event in London on Thursday, opting for an outfit that heavily leaned into the skater-girl aesthetic. The singer wore a Harley-Davidson graphic vintage T-shirt and Pro Club cargo shorts. Eilish completed her edgy look with a neon and black Nike beanie and a Supreme camouflage shirt underneath.

This is the second year of Overheated, a climate activism event presented by the public charity Support + Feed and Eilish herself. The event was streamed live on Eilish’s YouTube channel on Thursday, where she could be seen talking about her support for thrifting and other methods of sustainable shopping.

“I never, have ever, been interested in shopping at a ‘regular’ store,” she shared with her mother Maggie, who moderated the speaking segment. “What’s nice about thrifting is that you walk in and it’s hundreds and hundreds of just whatever. It’s this giant warehouse of everything under the sun that you can imagine,” Eilish later added.

Eilish continues to make more ventures into fashion and music. Her song “What Was I Made For?” is now the most streamed song from the film’s soundtrack, having been streamed 30.9 million times on Spotify.

Eilish also released her newest collaboration with Nike on Aug. 8. The Snkr app drop featured Nike Alpha Force sneakers in reimagined color ways, including a classic black and white, along with a red, black and white style.

The Overheated climate activism event featured sessions on sustainable fashion, the advantages of a plant-based diet and advice on how to help resolve climate change.