Have you ever been asked if you wanted to wear a diaper? By your parents or a nurse for example?
I was at a movie last night and recalled going to movies when I was a kid. We had to drive over an hour to the nearest 'real' theater because we lived in the middle of nowhere and then of course a movie is a couple hours long. I hated leaving a movie to go to the bathroom (still do) not only because it disrupts other people but because you 'get out of the groove' of the show. Then again, sitting there having to go pee means you're not focusing on the movie anyway.
I remember a few times, back when I was diapered for bed, being asked, "Do you want to wear a diaper?" when going to a movie or such. I don't think I ever said, "No". Thinking back, I'm not sure it was really an option anyway, but I always said, "OK". When I was wearing diapers every night (up until about 10), my diaper stuff was out all the time anyway, so it wasn't an inconvenience. Mom would put my change pad on the floor and I'd get take my pants off and lie down. It felt weird being diapered when it wasn't for bed; a lot more baby-like. This was the days of cloth and plastic pants, so baby powder and vaseline were all part of the package.
I recall watching the Muppet Movie, having to go pee, and just letting go in my diaper. After the show it think it was pretty clear I needed a diaper change. That was taken care of in the back seat of the car. As weird as it was being changed like a baby, I do remember it felt better having a dry diaper pulled up and pinned on!