(CNN) – Salarimen, throw on your Hawaiian shirts: it’s that time of year again in Japan.  “Super Cool Biz,” the Ministry of Environment’s annual energy reduction campaign, officially launches Friday across the country.

To reduce electricity use in corporate workplaces, Super Cool Biz encourages office workers to eschew their usual black suits for lighter clothing, including Hawaiian shirts, polo shirts, T-shirts, jeans, and sandals.

The campaign has been an inadvertent boon to clothing retailers, who have not only increased their stock of these items, but also specially designed garments for the season. FULL POST