They couldn't open their wallets to afford costumes that weren't purchased at Spencers, I'm pretty sure setting up a Twitch channel may be above-and-beyond sadly.
(Seriously I lost count of how many times Saori Anou's tits almost popped out of the ill-fitting get up they had her in.)
The groups are supposed to be representative of the ideas of female Japanese gangs. (It's a Japanese culture thing, there's a wikipedia page for it lol). Some of the outfits make sense. I look at Cherrybomb girls, ok these ladies could be a gang. Same with the Harijuku Stars, old timey kinda get ups but thematic and makes sense.
Dangerous Liaisons are dressed in Halloween/Fetish party costumes, and The Vandals is...well Ram/Yoneyama's personality better take the team far rofl.
And none of this is a knock on any of the women at all, the wrestling is great as you'd expect from a dozen+ seasoned joshi.