It is all about looking unique and being noticed when you walk into a club or party. A popular rave outfit is a costume. You should express your style for this. You don't have to get creative with it, but it will help you stand out among other ravers wearing similar clothes. Clothing is just one of many ways you can express your unique rave style. If you want to stand out in a crowd, consider having your clothes decorated with paint or temporary tattoos.