What is 'Cool Biz'?
The Cool Biz campaign was started in 2005 by the Japanese Ministry of Environment as a way to reduce energy consumption through lowered air conditioner usage. The key elements of the campaign are as follows:
・Keeping the office environment temperature at 28°C
・Not requiring suit jackets and/or ties (for those who wear them)
・Short sleeve (button-up) shirts or blouses
Japan is notable for its adoption of its Cool Biz campaign, and has attracted attention globally for this successful implementation.
For non-Japanese people, changing to a less formal dress code may take getting used to. Each company has its own style of adjusting to the summer climate. For example, some companies may allow shorts and polo shirts, but other may not; therefore, it is best to take your cues from the people around you.
Additionally, the official Cool Biz season is from May through September. This long period of time allowed for Cool Biz is due to some regions having longer summers than others. Depending on the company and region it may be extended or shortened. Once again, it is best to consult the people around you.
Overall, Cool Biz is a proactive method of reducing energy output, as well as providing employees with the option of wearing clothes suitable to the weather. As the days grow longer and hotter, remember to stay cool and hydrated in your professional life!
Source: Wikipedia: Cool Biz