I remember a long time ago on some site seeing someone who had come up with an inflatable AIO, it was insanely expensive (like 300 US).
It catered to ABs and the people with balloon and inflation fetishes. It was basically a double layered diaper cover you hooked a pump up to and got really, comically large
Edit:
Did a quick search, ironically led me back to here.
I like REALLY poofy diapers. Like, CARTOONISHLY HUGE and poofy diapers. The kind that might not even be made in real life. This is what I'm talking about (the pictures are by Kurikia on Furaffinity): Baby's day out Elora Sassy kitty I'd REALLY like to find a way to simulate wearing a diaper...
www.adisc.org