YEAH BUT THE WORLD DOES NOT NEED TO SEE IT!!
You are so right about that. The dress was inappropriate for public wear. Considering her father's position and aspirations, she certainly should not have worn such a revealing garment in public. My previous mention of the physiology involved was intended as tongue in cheek sarcasm more than as an endorsement of her appearance.
It pains my male ego to have to admit that I did not notice the anomoly that you address. I think I may have been distracted and repelled by her horse nose (and general unattractiveness) to the point that I didn't study the photo in question in detail enough to note the difference stated.