15 Billie Eilish Halloween Costume Ideas For All You Bad Guys

On the red carpet for the 2018 Young Hollywood Party, Billie sported an airbrushed sweatsuit, and it was straight out of a '90s dream. Maybe you have some gear left over from storming Area 51, or maybe you want to try your hand at a little DIY project.

What to wear: An alien-themed long-sleeved shirt and sweatpants with plain white sneakers.