Your best friend is basically your rock. She’s carried you through break up after break up, she’s listened as you pinned about your job, hell, she even reminds you when Mercury is in retrograde. She’s basically your soulmate, so it’s only natural that you coordinate outfits for Halloween. From classics pairings such peanut butter and jelly to iconic film duos such as Romy and Michelle, here are 50 best friend Halloween costumes you and your best gal can rock on All Hallows Eve.