Three million yen for something so diaphanous?! Wakamiya's lucky she didn't drip any blood on it after biting her finger that badly, because I don't think you could get bloodstains out of that particular material without damaging it.
Incidentally, if the mangaka follows the principle of Chekhov's Gun, the black-haired girl introduced in the previous chapter may very well end up being one of the models they're looking for. Edo saying that her body was better than any of the models they encountered and Wakamiya dismissing her as a "nameless girl" make it even more likely. Since they've already found Monika Lang, I'm guessing the girl is Sirius.
(Yes, I know she introduced herself as Adele Muller, but "Sirius" is most likely a stage name.)
Let's see how this pans out.