Japan is to try to improve morale among its swelling prison population by giving inmates more attractively colored uniforms and bedding.

Experts have advised the government that the clashing orange and green striped bedcovers prisons have been using for more than half a century could make prisoners nervous and aggressive, Kyodo news agency said.

The color psychologists recommended bedding in warm colors such as brown for a good night’s sleep.

Black and white striped pajamas and yellow-green uniforms were also criticised as “lacking brightness”.

The psychologists recommended they be replaced with mint green and pale blue outfits, to give prisoners a more positive outlook, Kyodo said.

Japan is rethinking its treatment of its more than 60 000 prison inmates after uncovering incidents of fatal abuse by guards at Nagoya Prison in 2001 and 2002.

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