Why do programmers like to wear plaid shirts?

My brother is a programmer, working overtime to write program code, and sometimes I haven't seen his shadow for three or five days. Sister-in-law likes to give her brother a plaid shirt best because it looks handsome. Sister-in-law also said that plaid shirts are resistant to dirt, and my brother looks full of energy in them. When I am not at home, I also have a soft spot for plaid shirts. It is said that once I went to their company, almost everyone in the office wore plaid shirts, and I secretly asked my brother if this was their standard work clothes. It turns out that every programmer has a plaid shirt at home. It's very simple to match. As we all know, programmers are very busy. They spend too much time coding programs and codes. It's no problem to have a girlfriend, and she is specially matched for it. Single people don't care so much. A backpack, a plaid shirt and jeans on the upper body almost became their costumes. Simple and good collocation, the most important thing is not to bother and take time.