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Artist's commentary
It'll be lighter if you take them off
Kage : "Ooh, I know. It's because your kimono sucked up a lot of water, right? Eh? Hime?"
Waka : ("I have to start dieting...")
A little scene of the two from the Princess Carry in post #1626261
I think swimming in such clothes would make it really heavy since it will absorb lots of water.