We live in a world full of different people. People are not only different from each other by means of their looks but also by thinking, and culture. Some people judge a person by their looks, they think it reveals their standards of living, society and about their religion. But, I adamantly believe in the old saying "Don't judge a book by its cover." I think its really impossible to know about someone's nature, and his mentality by looking at their external appearances.
First of all, the external appearances are misleading. As the looks are temporary and deceptive, its impossible to judge someone by their looks. If a person wears simple or cheap clothes, it does not mean he/she is poor. Maybe he liked it or preferred to stay simple than showing off by means of their clothes. For example, People living in Kerala wear simple clothes made up of cotton, it does not mean they are poor. They do so because they find it comfortable according to their humid environment. So external appearance does not reveal their wealth. It is impossible to judge folks whether they are poor or rich by only looking at their clothes.
Secondly, external appearances do not tell about someone's mentality; intelligence; and behavior. For instance, my friend had a crush on a person who always wears a good suit and ties. She thought he is a gentleman and really fell for her but then we find out he had gone to jail several times because of his bad behavior towards girls.
Last but not least, Some people judge people by their color. They think people who are fair in color are beautiful and those who are black are ugly. I believe all are beautiful regardless of their color. Moreover, beauty comes from the heart not only from looks. If the person, who only has good looks but not the good heart is no longer beautiful. Furthermore, beauty relies on the good heart which cannot be judged by seeing someone's looks.
In light of the above mentioned reasons, I strongly believe that external appearances are not the parameters of judging people because these are not permanents and not tell about a person's heart and mentality.