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Kiara said she originally would have liked a kimono more similar to what Mori ended up with (showing cleavage and having burned sleeves) but Huke already started making the kimono she has now and she didn't want to reject his design.
I wonder if something similar happened with Rissa, she seemed very excited about this slutty kimono and joked quite a bit about how "much" skin she is showing in her actual kimono - so it could be her mama already started working on the beautiful kimono she has now and she didn't have the heart to tell her that she wants to be a slut.