I'm new here but, at the young age of 61, not new to rubber pants. So in answer to your question, wetpants, have you tried the molded "nappy pants" as they call them by Fetisso?
Someone in this thread mentioned one of Fetisso's two abdl oriented products (the more commonly sole and visible product) and said they were low cut. Yes, this is so. But the other item they make (the rest of their many designs serve the "heavy rubber" market) is as pictured - not unlike the image you posted and I am guessing somewhat similar to the kind of thing that a toddler in the thirties might have worn if his mommy had money - tho I am also guessing that these would have been sewn, not molded.
Fetisso's own site is fetisso.com but there is not much there of interest to us. Instead, try a canadian site, Kalesenterprises.com Nice guy. Name of Heimo Hakuli - Fin if I recall. Enter this url in your address bar: http://www.kalesenterprises.com/newproducts.htm#Dip1
item DLT-NYP-BL17 is what I am referring to. That is his "product number" (sigh). Fetisso's product number is 4620 I think. Heimo's site is a little wonky but he is sincere and honest and easily the cheapest guy in town. His photos do not show it but the fetisso product does come in "natural".
It is truly an amazing piece of rubber. Indestructible. You could run a team of horses with it. Better, it does not require talc. The latex is treated (I seem to remember something to do with chlorine gas) to make it permanently non-sticky. Four sizes and a choice of colours and, by the way, thicknesses. Most of the stuff you see on Heimo's site he make himself and will do custom orders of any kind, pretty solid work. He makes the stuff himself - no 10buckanhour elves in the back room.
I think Fetisso's designer based their sizing on a german model because I am 6 feet with a 32 waist and the small is still a little loose at the waist for me. Nonetheless, "the cadillac of rubber pants", as I saw it described somewhere. No, I don't own part of the company. But I have gotten to known the guy who does all their web stuff and communication. He's German-Swiss working in equatorial Brazil - home of Fetisso and of the rubber tree that started it all. Amazing where business (and pleasure) will take you.
The photo you posted you titled "old". Looks to me like a few years, custom made in England or Germany. "Glued, not molded", as james bond would have it. Nice work. Curious to know where the pants are from. Also, I confess I am amazed that at your age your were, "raised on Playtex rubber pants". Figured they were long gone by that time - if you mean "rubber" literally. Please say more.
Anyhow, now I have to go an image. Hope all this helps. BTW, I tried emailing you direct but ran into Yahoo messenger. I am not keen on adding new invasive software to my machine. But you can get me direct as I have listed my email. Surely all those 9/11 guys have something better to do.
best, sunsoul.