I fully agree with this idea, people behave differently when they wear different clothes. People wear clothes when they are in a social life in order to show their status. A king of the country, doctors or teachers and a sport player behave distinct way from each other.
You begin the essay answering directly to the prompt. However, this task is going to test your writing skills and therefore you need to present a good essay. In the introduction for introduce your topic to the reader and then state your opinion. Don't let your essay sound like a direct answer to the prompt. It should flow like an essay.
First of all, Whenwhen someone wearsathe costume of a king, he will start to behave differently.
.... First you need to tell the reader why you think so and then support that reason with a specific example. This one sounds like an example.
It takes all the responsibility of the all country alone.
... it takes/ they take
Seems like you need to have a good idea about the essay structure.