Actually I think two reasons. No.1, it is about the mood. I mean people like to wear different kinds of clothes mainly because they want to stay in a good mood. I mean by doing so, they would feel much happier in life. This is the main reason I think. Another reason is that people have to do it. Especially when they are at work or at study, they have to wear some sorts of clothes they have to wear it. No other reasons. That is it.