Given that Japanese bureaucrats could be described as sartorially challenged, the government has ushered in what may be their worst nightmare with a "Super Cool Biz" campaign that advocates wearing coloured shirts, T-shirts and sandals to work as a way to reduce electricity use this summer.

Many companies have pledged to keep office thermostats at a steamy 28C in response to a decree to cut electricity use by 15% as a result of damage caused to Japan's nuclear-powered generating capacity by the earthquake and tsunami.

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