This list has all of the best Halloween costumes for best friends. These costumes are cute, funny, scary, DIY, easy, creative, unique, and matching. You'll see ideas for women, for girls, and for teens. There are costumes for 2 friends and costumes for 3 friends. Some are Disney, like Monsters Inc and Lilo and Stitch. Other costumes on the list include milkshakes, Gossip Girl, Betty and Veronica from Riverdale, Lucy and Ethel, and more. These work for college friends.