Yes . . I agree that the story upstairs is very prominent. . . Here we go again. . . At that time, just after the founding of the People's Republic of China, everyone's thoughts were very conservative, and some clothes with too bright colors would feel inappropriate to wear, so think about it in combination with the background at that time. . . I think that's why. . It may also have something to do with the popular Zhongshan suit at that time. . . It seems that most Chinese tunic suits are blue and gray. .