9話のライブ衣装が可愛かったので・・・
ちなみにぴょんぴょんジャンプしてるシーンでゆうぎり姐さんの乳が揺れてなかったので、サラシを巻いたものを思われます。

Since the costumes for the live show in episode 9 were cute...
By the way, in the part where Yuugiri-neesan jumped up and down her chest didn't bounce, which makes me think she wore a sarashi.