Traditional figures wear helmets.

Let's make it clear first, nine times out of ten, Guan Yu's cuckoldry is due to the preconceived characters in film and television works, which gives people a wrong impression.

In the Romance of the Three Kingdoms, Guan Yu was portrayed as a god, at least he must be a fairy after his death. When he was alive, he was praised by later generations for his loyalty to Liu Bei, supreme loyalty, high martial arts and invincible achievements.

As for Guan Yu's image, it is described in the book as nine feet long (more than two meters high), with a beard two feet long (over the belly), a heavy jujube on his face (dark red), a fat lip (bright red), a phoenix eye and an eyebrow, and a handsome face. After the general, I like to wear a green robe and golden armor, sit down and chase the red hare with a dragon crescent moon blade in my hand. How awesome!

Attention! Guan Yu just likes to wear a green robe, but he has never said a word to describe that he likes to wear a green hat. It's just that later generations associate Guan Yu's image and think that a green suit may be more appropriate, so they cuckold Guan Yu.

There are basically two kinds of ornaments on Guan Yu's head, one is a hat (also called a headscarf) worn in non-wartime and the other is a helmet worn on the battlefield. Then it should be normal for ordinary hats or headscarves to have a little color, but helmets don't have so many colors to choose from. Generally, it is either a gold helmet or a silver helmet or a metal primary color or a black helmet.

At the end of the Eastern Han Dynasty, although the textile technology had existed, the dyeing technology was not so advanced, so it was difficult to dye it as brightly as we thought, usually in a dark color system. So Guan Yu's hat or headscarf is dark green and gray, even if it is green.

To say the least, in the Three Kingdoms period, green was only the original meaning of green, and there was no other extension.