Official Billie Eilish Merchandise, 2021. Constructed with a soft cotton blend, this Billie Eilish graphic crewneck is made for lightweight, all-day comfort. Size up to get an oversized fit. Since the age of 13, Billie Eilish has become a music and style icon across the globe. She is known for her haunting vocals and unique style and continues to test boundaries with her creativity and talent in her sophomore album, Happier Than Ever.