Yes it's okay for adults to go outside wearing just a diaper as the diaper covers up your private parts.
I've gone outside in public wearing just a diaper and have not been in trouble for it.
You might get a few laughs or stares but nobody will really care if you're out in just your diaper.
If kids can go outside in just diapers then so can adults.
I like to dress like the boy in the picture below.
Wearing just a shirt, socks and shoes and diaper feels great.
More pictures of the Diaper Boy Tommy at the link below.
https://www.imgvek.com/album/79f889529f8895c1d29763f79c67b0d9/Diaper_Boy_Tommy
The reason it's shameful or considered shameful for adults or older kids older than 3 to wear diapers is because diapers are considered to be used for babies.
However diapers are for all ages and there's no age limit to wearing diapers.
I actually like feeling like a toddler when wearing diapers and I wear diapers now as an adult full time and no longer use the toilet.
If I have kids one day I'm gonna make them wear diapers all the time as well and never potty train them.
Diapers are much better than using the toilet anyway.
I no longer use the toilet anymore and have worn diapers all the time now for almost 9 years and so now I cannot go without wearing diapers even for a day.
Well technically I could but I would probably end up with wet pants as I've lost a little bladder control since wearing diapers all the time now.
Going hiking in a diaper or going on a diaper hike feels great.
I've worn diapers going hiking and it feels great to hike in diapers and when the diaper is wet or even filled with poop it feels even better to hike in diapers.
When hiking in diapers you don't have to stop to find a place to pee or poop and can just pee or poop the diaper and go on about hiking.
I've also gone hiking on a friend private secluded property wearing just my diaper, socks and shoes and it felt great as well.
I live in town right now but have a fenced in back yard that I go out in wearing just my diaper and shirt and shoes when it's warm out.
But when I can save enough money I plan to buy several acres of property and live out in the woods where I can roam around in just my diapers without pants.
I wear diapers full time and have worn diapers full time for over 5 years now and no longer use the toilet.
Since I wear diapers all the time now and go everywhere in diapers and yes I've gone hiking while wearing diapers and it's never been a problem.
I would recommend adding some baby powder to your diaper and add some diaper rash cream to around your leg areas to prevent any possible chafing as your legs move back and forth against the diaper.
I wear some thick adult disposable diapers from ABU Diapers when hiking and haven't gotten a rash or chafing when hiking.
Hiking in diapers is very fun and when you're wearing diapers when on your hike you can go pee or poop when needed without having to find a place to use the bathroom.
Diapers are my bathroom all the time now and I never use a toilet at all.