The drawing on the right, as in the stylized "skinny" one from the comparison drawings? The difference between those two side-by-side pictures is the body, not the tightness of the outfit. Again, the one on the left is traced from the actual photograph. Look at the actual photograph of Taylor Swift in that post. Where do you see a bunch of loose fabric in that oufit's torso? Do you actually think Taylor Swift is swimming in that outfit since she's actually as skinny as she was 13 years ago? Just her legs alone, which are not under that dress, will clearly demonstrate otherwise.
Of course a picture of a much skinnier Taylor Swift will look skinnier than one of a less skinny Taylor Swift. But that has nothing to do with the visual illusion described being apparently dishonest, which was your last assertion after you moved on from the semantics being the whole problem. This has taken quite a journey since your original assertion.
All of this is proving my point that this entire post is only a problem for guys who just want to argue about a woman's body instead of the visual illusion. Not a single person who is arguing about "skinny" vs. "thin" semantics is demonstrating a single thing about how it affects the theorized illusion, that clearly isn't their interest. To them, this post is just an avenue to share "valid opinions" on the right way to describe women's bodies.