Old, ill-made, un-ironed, poor fabric choice... Imagine the rush at Vogue that day: "Oh, dear lord, we forgot the photo for this dress! Quick! Pull it out of the stack, drop it over a model's head, take the photo, and get it to the publisher before closing time in fifteen minutes."
I have a pattern of that style from the late 1960s or early 1970s. Had a similar one from the 1980s, plus the giant shoulders popular then; not sure the latter survived The Great Pattern Purge of 2015.