>>19616340This is not a painting, anon, but I see where you're coming from.
You have to see this from a fashionable standpoint, where white would make her hips seem even broader which could distort her proportions, this is why fat people don't wear white and stick to darker colors.
Anorexic may needs this white not only to balance out her top but to also bring some wideness to her middle part.
I made some edits nonetheless.