15 Best-Friend Halloween Costume Ideas

The hardest part of this best-friend Halloween costume? Deciding who gets to dress up as Justin Bieber and who gets to dress up as Post Malone. For Post Malone's look, wear an all-white suit, braid your hair, and create some DIY facial tattoos with an eyeliner pen. For Bieber, unbutton a Hawaiian shirt, wear some khaki pants, and wrap a bandana over your forehead. Easy!