Just getting a giggle that you got a "dose of reality" out of an Elvis movie!
Seriously though, things have changed a LOT. I have gotten myself down to today's size 2 or 4, but when I went to try on my mother's size 8's from the early 1960s (she still has some of her gorgeous dresses from that era), I don't even come CLOSE to being able to zip them! Now, some of that is because she is about 5'2" with a small frame, and I am 5'7" with a (marginally) larger frame -- but it was still kind of an eye-opener. (For both of us -- she said she was always telling herself she's only a couple of sizes larger than she was back then... but that's only becaue the sizes have changed so much!) And Mom says she wasn't remarkably small then -- while people seem to think I am on the small side now.