It was the tail end of another long, hot Tokyo summer, and salarymen across the city were looking at their wardrobes with dread.

Every year from May to September, Japan¡¯s famously conservative corporate workers and government employees set aside their stiff, dark suits for more casual attire. Out go the neckties and starched shirts; in come short-sleeved polos and linen shirts, even the occasional Hawaiian. Then, as the calendar approaches October, formality returns, if not drastically cooler temperatures.

The metamorphosis is part of a Japanese initiative known as Cool Biz, a glass-half-full description of what could just as easily be called ¡°Hot Office.¡± Starting May 1, workplaces set their thermostats at 28 degrees Celsius, or above 82 degrees Fahrenheit, to save energy ¡ª a sweaty proposition in humid Tokyo.