A few years back my wife needed range of motion therapy after surgery. She told me I would enjoy going with her, that I would like her therapist. I went and the lady was pleasant and pretty, but I didn't notice anything special.
Once in the car my wife asked me if I had noticed her diaper! I was like no way!
The next time she went back she couldn't have stopped me from going, and she was right, you could plainly see a diaper out line and I even heard it crinkling.
This just goes to show how we are probably not noticed by most others.