Honestly ? Isn't a bit cliché to assume because the album's title contains the word "Japan" so she has to be dressed like a tradional japanese ? I would like personnally because that's representative of this country but from what I understand she found inspiration in the Japan of today not the one of the past centuries so I don't expect her to use this cultural aspect of Japan !
Btw I found an article that seems very revealing about the new album if someone is able to translate it it would be amazing !!
http://109news.jp/event/20160503/58789/?detail