Why is it easy to make a mistake when judging a person by their appearance?

Of course, there is a saying that they are greeted by their clothes, but by their minds they are seen off. But the first part does not always work. It happens that even very interesting and well-read people absolutely do not follow their clothes, and look rather untidy. Also, according to clothes, it is not always possible to tell what a person’s income is. For example, many wealthy people do not like to spend a lot of money on clothes and dress quite simply. So, in no case judge people by their clothes – this is wrong.