15 Billie Eilish Halloween Costume Ideas For All You Bad Guys

Billie loves a good matching set and chose a lime green option for the 2019 Reading Festival she performed at. With a color scheme straight out of Slytherin House, you will surely look unforgettable this holiday.

What to wear: A tie-dyed oversize t-shirt and shorts and white high-top sneakers (Billie's fave is the Nike Air Force 1 High PSNY). Pull your hair into two loose buns on either side of your head to finish it off.