I'm pretty sure the only reason we see outfits more than once is because they record a few performances at a time.
I guess you're right.
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Moving on to news and announcements...
http://www.helloproject.com/news/9811/
Kobushi Factory was announced to be the guest act at Morning Musume ‘19 Concert Tour Haru ~BEST WISHES!~ on 3/16, 3/17 and 5/4.