NAHA, Okinawa Pref. (Kyodo) Clothing makers in Okinawa are profiting from strong demand for "kariyushi" Okinawan summer shirts, the latest must-have fashion item as the Cool Biz campaign enters its second year.

Similar to Hawaiian aloha shirts, kariyushi are unique to Okinawa. Kariyushi comes from the Okinawan word for "happiness."

During the subtropical prefecture's hot summers, kariyushi have long been an acceptable substitute for Western-style business attire.