I have to agree that the dress is positively atrocious
That's really the point. I'm not a very visually sensitive person, and yet the damn graph dress jumped out at me. I might not have noticed the lack of drapery if it had at least respected chest/arm boundaries, but it didn't. (I didn't noticed the filled skirt until I was looking over things more critically, because of the dress.) It was bad enough that someone who by default skims over the art went "wait, hold up".
You can see similar things even in high-budget promotional art that you'd expect had dozens of eyeballs over it. (Another example; Persona in general is frequently guilty of it.)
Probably an artist or tailor would be more sensitive, but for me those fill patterns are "good enough". The Persona guy's folds seem plausible at first glance. I do have a problem with blue girl's top, but it's less about the fill and more about "what are these lines and pieces even supposed to be?"
It's a valid observation, but ultimately not any different to "real hair doesn't work that way". Like, yes, so what? You choose to pick up the picture book with the deliberately exaggerated and stylized art.
There are degrees of expectation, as you know.