Put your diaper on, put a pair of net fixation pants on, (if you want to wear plastic or rubber pants over your diaper put those on first before putting on the fixation pants), then put a large pair of boxer briefs, then put your trousers on, next you put a t'shirt or vest on, if you put a vest on instead of a t'shirt you then put a shirt on, if you put a t'shirt on instead on a vest, you then put a jumper on, next if you are wearing a jumper you put a coat on, if you are wearing a shirt you put a jacket on.
Make sure your t'shirt and your jumper is a size to big, as you don't want them rising up and exposing your diaper.
Weather or not you choose to wear plastic or rubber pants, by wearing net fixation pants, over your plastic or rubber pants (if you choose to wear plastic or rubber pants over your diaper) you hide part of the diaper bulge, inhibit the crinkle and stop the diaper butt sag, by putting boxer briefs on on top of fixation pants your diaper becomes almost invisible. The only way anyone can tell you are diapered is if you make it obvious or tell them.
After messing yourself it takes 17 minutes for other people to be able to smell you, you have that much time after pooping your diaper to find a place to change, if you prefer walking around in a poopy diaper (as I do) then use Chlorophyll pills to remove the poop smell, however these will take 2 weeks to start working (always read the instructions and consult with your doctor)
Next you put shoes and socks on, after that it is up to you if you want to wear a tie or bow-tie or anything else, my advice is try to look natural, act natural and walk natural. If you are waddling like a toddler, people will notice, so try not to do it.
All that you have left to do now, is walk out the door, lock the front door, and go grocery shopping for the week, or you could even go to a pub or restaurant and have something to eat, or just go walking for pleasure and exercise.
That is how I wear diapers in public,
However if you are thinking of wearing just diapers in public, I would say don't, while it is not illegal, it will strike many people who see you as; not normal, mentally retarded, insane, pedophilic, threatening, dangerous, weird or even just plane wrong, while we all know there is nothing wrong with just a diaper outside, other people do not, and because of lack of understanding they are intimidated by it, which often leads them to calling the cops, even though there is nothing illegal about it. IF you are going to wear just a diaper in public, find your self a forest or a desert, or some wear wear people can not see you, then you can run around in just your diaper as long as you like, do not try taking your diaper off, the one thing that makes wearing a diaper in public legal is because a diaper is classified as an undergarment if you are wearing undergarments you are not nude.
But walking around in just a diaper, or even just a diaper and a t-shirt in my opinion is not correct, this is because there is to much risk associated with doing this.
If you are going to wear a diaper in public wear cloths over it !