>>2206006That's convention.
Think of superheroines whose outfits look like bodypaint.
Cloth under tension won't "dip" to fill in the gap between high points.
You can't get that effect unless it's rigidly "molded in" like the "muscle suits" in Batman movies.
I totally agree Real Life doesn't work like that. But this is anime.
Why do you say "she's dried off now"? Looks like she's on the ladder climbing out of the pool.