The world has all but fallen to ruin, because of humanity's irreversible impact to the environment. The rich and powerful live in the few havens that exist. Most others have formed their own societies, and it's a do or die world. The powerful are constantly hunting for those who don't belong. In other words, outsiders. The color of your clothing and how you wear it signifies what society you are a part of. They are constantly at war with one another, fighting over territory and resources. This would be the common attire for one to wear to protect themselves from the sun and elements, stay hidden from the powerful, and stay protected in battle.