These kind of look like the things from their own wardrobe maybe. Hopefully it's just a test and they try and make the outfits more cohesive for the actual release. Remember when fan reaction was bad toward Say Yeah Motto Miracle Night, so they changed it? lol I wonder what the wota are saying.
When they have the other groups dress in normal clothing, at least there is always one recurring color or accessory that signifies that this is a group together. Like how JuJu have the black/white going throughout, despite having different outfits. Or how C-ute was in all pastels for Aitaix3, and that they all had something black within their outfit on the Queen of Jpop covers. The only unifying factor I can see is that the dresses are long and flowing, save for Captain and Momo. And how on earth did they manage to make Miya look frumpy? She looks good in everything but the outfit that they put her in here.
It's just, right now anyway, an unrefined effort all around. The dance is weird and needs some work and the outfits don't match. I do love the song though. It's like Nanchuu's mature older sister imo. Please please please let this shape up in time for release~