Then I put an excerpt from a news 2 years ago.

Members of the Japanese Government presented today at their offices without a tie or jacket, offering a revolutionary image that will last all summer and pursuing energy savings to meet the protocol Kioto.Este striking change for a conservative society, in which to bring a dark suit and tie to work is an essential uniform, goes beyond fashion and style, as it pursues energy savings, in order to meet the Kyoto protocol.

A lighter clothing during the summer wet and sticky Nippon would prevent, in principle, the excessive use of air conditioners in buildings both public and private sector.

(Via: The world )

What about this is because since June 1 begins the "Koromo gae" (changing clothes in season), day in which the vast majority of schools in Japan changed his uniform of her summer winter.
As we see in the news, many companies also follow this protocol and as of June 1 can go to work without a tie or without jacket (Japan is a country where most workers are forced to wear a suit in the work). According to the companies, this is done to save energy by using too much air conditioning etc, but in fact this custom comes from the imperial court for hundreds of years, and gradually was imposed throughout society.
There are also companies in which this does not apply, and despite being summer, workers must continue to carry a jacket and tie. This very large companies are usually in the for the company is very important to save the image.

In my school have also applied, and on June 1 arrives to school and met all the teachers in Hawaiian shirts. In my school from this day, all the teachers wear shirts with Hawaiian motif.

Then you have some pictures of my school.

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