The year was 2001, and Spears actually made us believe that we could not only go to the moon, but meet and fall in love with a cute astronaut up there, too. This red latex look is a surefire, instantly recognisable Halloween hit.
What to wear: You know the drill — red latex bodysuit with sturdy black boots (because you can't dance on the moon in sneakers). Wear a long wig in a high, slicked-back ponytail, and pile on the white eyeshadow.