Subject: Do you agree or disagree with the following statement? People behave differently when they wear different clothes. Do you agree that different clothes influence the way people behave? Use specific examples to support your answer.

Some people like wearing different clothes from everyone.They usually wear strange and unusual clothes.I do not prefer wearing different clothes.However, I agree that different clothes influence the way people behave.I think, if people wear different clothes, everyone may think that they are awkward.But if you wear normal, clean and tidy clothes, you may used to every situation and you can be happy.My arguments for these points are as follows.
The basic structure of your introduction seems to work well. However, I think your first 3 sentences need a little work. The 1st and 2nd ones are especially too short which makes it a little too over simplified. I would have discussed how clothes change from one profession to the other and as to why they need to wear these clothes in the 1st sentence; the 1st sentence as it stands is a little too narrow to develop.

The first reason as to why I believe that different clothes influence the way people behave is because if a person wear different kind of clothes, he or she can feel uncomfortable and maybe he or she can not used to other people.For instance, we had uniforms when I was in high school in my country.However, we were able to wear daily clothes once a week.One of these free clothes days, my friend forgot to wear daily clothes and he came to school with school uniform.He couldn’t used to school and he felt uncomfortable in that day.Because, he was looking different from everyone.

The second reason as to why I believe that different clothes influence the way people behave is because I think wearing clean and tidy clothes is important for a lot of person.Before you met with someone, you look his clothes first.If he or she looks good, you think he or she is a nice person whether you know his real thoughts or you don’t.In my first school day, I didn’t know anyone in school.When I saw a person who has good looking clothes, I automaticly had good feelings about that person.

I am afraid that the reasons and examples that you have chosen haven't really answered the question which asks "how wearing different clothes influences peoples behaviour" The point made in the fist supporting paragraph would have been fine if you had stated that wearing ordinary clothes once a week made everybody behave in a casual manner and when they wore the school uniform they behaved more formally. I am afraid that the 2nd supporting paragraph didn't really work at all (despite being a very good point!) as the question asks how the person who wears the clothes changes and not the person who sees the change)

Also, my another reason is wearing good looking clothes makes people happy.If you wear your favourite clothes and when people say you look great, you become happy.When I wear my favourite jean and t-shirt which they match eachother, I always feel cool and happy.

This has the potential of being a great supporting paragraph; I can only assume that you had timing problems which is why you failed to develop it any further (in fact this would have been a better supporting 2nd paragraph.

To sum up, people shouldn’t wear different clothes all the time.It influences bad to their behaves because of the reasons are in above.

Overall, I would say that this essay is worth around 2-3 points due to digression and the number of grammar mistakes.