My first orgasm was in plastic pants that were improvised from a bathroom curtain. I didn't have the experience most of us here had of plastic pants being used with diapers because no one in the family or nobody I knew needed to wear them. I didn't see clotheslines at all...probably because not a lot of people used them in western Washington, or because there were a lot of woods where we lived. So my introduction to plastic pants was because of plastic aprons, shower curtains, and rain jackets.
I'm pretty sure that if I had known any other kids who wore plastic pants and diapers I'd have become attracted to diapers too.