Why did the official hat of the Song Dynasty have two long wings?

First, the reason:

The inventor of the winged hat was Zhao Kuangyin, the founding emperor of the Song Dynasty.

The long wings of the long wing hat are made of iron sheets and bamboo strips. The iron wings on both sides of the hat were worn by more than a foot each (which became more and more popular later). This kind of hat is not worn in other general occasions except for formal activities in court and officialdom. Because wearing it, it is extremely inconvenient to walk in the street. Officials can only talk face to face, and it is difficult to sit side by side. From then on, it was difficult for ministers to line up in court and whisper to each other, which affected the seriousness of the court.

In fact, this design is somewhat similar to the tassel of the ancient emperor's hat. If the emperor walks indiscreetly, walks fast and frivolous, or sits still and shakes his head, the tassel of his hat will affect his sight, and even hit his eyes when he swings. Therefore, this design can be used to remind and correct superiors, which will naturally produce majesty and also imply that superiors should be correct in character.

Second, the introduction:

This winged hat was invented by Zhao Kuangyin, the founding emperor of the Song Dynasty. This is the hat worn by Song Dynasty officials. Long wings are made of iron sheets and bamboo strips. The iron wings on both sides of the hat are worn away by more than a foot (longer and longer). This kind of hat is not worn in general, except in court and official activities.