In the book "Hirohito: The Making of Modern Japan", the author points out that the focus on the Rape of Nanking, and the "comfort women" has overshadowed the experimentation on Chinese citizens. The Japanese used a wide variety of chemical and biological weapons, and many feel the toxins and agents are still in the land and still killing.
Additionally, those who have seriously examined the death toll find that the "hundreds of thousands" is grossly understating the truth. It is highly likly that the actual death tollin China alone runs to the millions, and may rival the death toll of the concentration camps built by the Nazis.
The Chinese know this, and for anyone to wear anything glorifying the Japanese military is beyond foolish.
No. It's stupid and decadent, but like the idiots who wore swastikas in the early punk days, stupid as their "statements" were, it is a sign of freedom.
Wearing a dress like this is China is a positive sign.
She and whomever she is associated with are actually much greater forces for good in China than the people who would say she has no brains or are aghast at it or want to attack her.