Opera windows were pretty standard across the Big Four in 1974. I don't see this as the "reason" that these are called "Formals", as that was not Chrysler's name for the style, yes?
I read it somewhere so I started using it and it stuck.
You need to ask Mr C where it came from. I was merely an early pioneer spreading the gospel, not the originator. And everyone drank the KoolAde.
I don't get it. It's a Formal because it's a creepy pic taken by some guy who is peeping on a young girl? I think it's more like why Chrysler lost market share.