I recall wearing a zippered sleeper with footies and non-skid material on the bottom of the feet when I was about 4 - 6. I liked it a lot as it kept me warm but also went over my trainers and plastic underpants so it was bulky enough to hide it. I could hang out in the mornings even if wet and watch cartoons. It was never a big deal if my family saw my undergarments, especially in the warmer months I just wore a pj top and then my trainers / plastic underpants, but I would never let anyone else see me this way outside my family. Even if someone came in our house quickly you could not notice I was wearing protection beneath my sleeper.
I do recall the last time I ever wore a sleeper like this though I must have been about 6 and I had to go to the bathroom real bad before bed. My older brother was watching me as my parents were out and I could not get the zipper down as it was stuck on some plastic damaged portion of the teeth and I was struggling immensely. My brother was laughing as I frantically flopped all over the floor while he was applying a bar of soap to the zipper to get it to slick-up and move and we got it down enough I could pull myself out of it but by the time I reached the toilet I had 1/2 wet myself and had to to just go to bed as is. When mom saw my partially ripped sleeper and heard the story and my despair of trying not to have an accident in my trainers and plastic underpants while still awake, she threw out the over-used sleeper and I never saw one again. After that dreadful incident I never missed a sleeper again as the mental effects of being trapped in it lasted a long time.