The actress revealed that she still has her 1950s pastel pink dress from the Enchantment Under the Sea Dance, reported People magazine.
"I can't get in it any more, though. It was so tight! It was tight at the time, but now it's really, really tight.
"It was beautifully made, and made to order for me. It's got a low-drop waist, and the way it was cut was just so beautiful. And it's still in great shape. I've still got the shoes. The shoes are even hard to get on now - my big ol' feet from having babies," Thompson said.