Lei Wulong - What is he wearing in this picture?
 

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You`ll find more realistic answers by looking outside of Japan - at China, specifically. Those are Chinese style clothes on a Chinese character... That was created in Japan.
The clothes aren`t of Japanese style at all.

As far as I know, these clothes aren't japanese but chinese ./

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qi pao
should be what they're called
and no
they are not japanese...