In soccer, they don't have a color/ white rule on the professional level like in other sports, like how in football you wear color at home and white on the road. The home kits are in team colors and usually have a very traditional style that every year's kit follows. Man City always gets a light blue home shirt, West Ham gets a red shirt with blue sleeves, and Chelsea gets a Blue shirt and shorts with white socks. Most every team has a general style that fans expect their home kit to be in. The away kits can be anything as long as they contrast with the home shirt. Many teams have traditional away colors too but the tradition isn't followed as closely. The third kit contrasts with the other 2 and has a less traditional design.