It is indeed. 😀
Truthfully, though, we all know Eto WOULD wear a bra whenever she invites Arima over.
Imagine him seeing her in battle, then later that night at home. .
“Wait, Eto, you weren’t wearing a bra earlier tonight – wait -”
“They’re uncomfortable, Kishou.”
“Wait! Do you wear them to see me struggle?”
“You’re sexy when you struggle, Kishou.”