Our parents choose clothes for us when we are little kids. But now, most of us can dress for ourselves. Girls want to look beautiful and boys want to look handsome. They usually choose their favourite clothes. Very few people don't want to look nice.
Of course, most people dress for their work. My mother is a doctor so she has no choice, she has to wear a uniform at work. She can wear what she likes only at home. My father likes sportswear, but he always wears a uniform because he is a policeman. I like bright colors so I usually wear casual clothes. I only wear school uniform at school meetings.
So it is necessary for us to have different kinds of clothes. When we are at school or at work,we must wear uniforms. When we are at home or stay with our friends, we can wear what we like. But we must remember, different occasions(场合), different clothes.