As fashion is important in our society because explains in a simple and visual way our way of thinking, our evolution as a country, the cultural aspects that shape our personality.
Japan, is pretty complex and unique; you can easily see it on the fashion street that you would not be able to see it again in another places on this planet.
Now you can compare then and have a more open point of view, for me the Japanese style is so crazy and creative that sometimes is using too many elements that at the end are destroying it.
It is maybe is the way of hiding more complicate problems into their personal relationships, they are loosing the contact between them and the fact of trying to attract somebody next to them may need more colors on top.
This is a simple idea, I hope you have a better one to share.
Of course do not forget the manga, the ZEN, and the nuclear stuff in their minds; a simple crazy coctel.