As a child, I used to take diapers and plastic pants from my brother and hide them to wear when I was alone. I was never caught actually wearing them, but a few times they disappeared before I had the chance to use them, so they must have been found. A couple of times after having accidents, I suggested to my mom that maybe I needed a diaper “just in case”, but was never put in one. She likely put two and two together, but never said anything. As was said above, moms know.
As an adult when I was sharing a house with a roommate, he was out one night with plans to stay at his partner's place, and I was enjoying the time at home alone to be diapered. I was doing some kitchen plumbing work and sitting on the kitchen floor in front of the sink soaked and very soggy, when my roommate and his partner burst through the kitchen door. Change of plans - they were going to watch a movie and stay at our house instead. They settled in the living room that was my only path to the rest of the house. Fortunately, I had shorts on over my diaper and didn’t think it was noticeable as long as I was sitting. In its droopy, sodden state, though, I could not walk right by them without the bulge and crinkle making it obvious what I was wearing. I was trapped in the kitchen, and now I needed to pee again. I kept working for a while, hoping they would take a break or head to his room, but they only came to the kitchen for drinks and snacks before going back to the couch. Eventually, I couldn’t hold it any longer and wet my diaper again. This time it was too much, and the diaper leaked, soaking the rear of my shorts, so there was no way I could sneak past now. Eventually, I heard one of them go into the downstairs bathroom and the other upstairs, so I made a break for it. I ran upstairs to my room, and just as I was opening my door, my roommate came out of his, getting a quick glimpse of me as I quickly shut my door behind me. Between the hour or more I was sat in the kitchen in my diaper, and running into him in the hallway, I have no idea how much he saw or noticed. He never mentioned anything about it, but I sensed a slight change in his interactions with me after that, so I suspect he may have at least seen the wet shorts. For other reasons, I moved to my own place a few months later, a much better situation for enjoying diapers without anxiety.