There have only been a small handful of times where I was sure they realized I was wearing diapers while out and about. Once a man in an ATM bank foyer, heard and recognized the familiar crinkling diaper sounds coming from my shorts in an extremely quiet area. Quickly turned and look right down at my shorts. He knew right at that moment.
Another time, while in isle at a local pharmacy, woman quickly looked right down at my shorts, then right at me with extremely surprised look. She definitely recognized the familiar diaper bulk from under my shorts. Saw it instantly.
Another time, same exact thing from a mom in Costco food store while on line.
I guess some will notice when I am out in diapers under shorts or, in cooler temps, cotton sweatpants. If you notice, if you look, you will definitely see that I have diapers on. But most won’t, they just go about their day and won’t take the time to look or notice. Some will notice but just won’t say anything or behave in a way where you notice they noticed. I guess parents, caregivers, nannies, medical people will have a greater chance of noticing, simply because it is a very familiar look to them that only diapers can have. They look, they will know instantly. Guaranteed.