15 Billie Eilish Halloween Costume Ideas For All You Bad Guys

How could we ever forget about this one? For the 2019 ASCAP Pop Music Awards, one of our favorite cartoon trios made an appearance on Billie's look.

What to wear: Try to dig up a Powerpuff Girls t-shirt and layer it over a white long-sleeved shirt. We're big fans of the crossbody messenger bag for storing extra snacks.