so, unless your wearing skin tight spandex, or like a one piece swimsuit i dont think anyone is going to notice.
I think 95% of the people wouldnt notice someone walking around in nothing but a diaper or naked...
But, in all seriousness I wear for need and wear all the time, and before i was in a wheelchair most the time, i still wore out in public and i'll say that even my GF couldnt tell if i was wearing a thin pad or a megamax under my normal clothes, and i ususally wear shorts and a t-shirt, so nothing special.
And if anyone does see they will think your wearing for IC needs like i have to, and that is what your supposed to do as an adult, wear the diaper to keep things from getting full of urine and be kind to others out in public.
If someone see your wearing a diaper then really who cares, and it's not a big deal, like no different than if you wear no underwear or if you go with boxer briefs who cares.
Dont worry what others think about your underwear and wear what you want to, period.
now, prob not wear a full pair of spreader pants locked on in public like the ones from germany, that might be a bit much