《宋书·志·卷十八》
遂伐制度，祭祀五郊，天子与参与祭祀事务的人，所穿祭服的颜色分别与五方的代表色相应；百官当中不参与祭祀事务的人，各自穿常服跟从。
汉制，祀事五郊，天子与执事所服各如方色；百官不执事者，自服常服以从。
So cut the system, sacrificed to the five suburbs, the color of the sacrificial clothes worn by the emperor and those who participated in the sacrificial affairs corresponded to the representative colors of the five directions; the officials who did not participate in the sacrificial affairs followed suit in their usual clothes.