He decided to change the world in a way which would leave a very noticeable impact on day to day lives. "This might turn out fun!" And so he started work.
Jeff started to put in his global change; Now, it would be considered normal for people to walk around entirely nude. Only in specific circumstances would people actually wear clothes, such as if it's specifically required like diapers, or when people would freeze without it. There also wouldn't be any embarrassment from nudity.
He put in the specification of diapers being excluded so that younger children, or sometimes the adults that still wear them, wouldn't sit there pooping on the floor or streets and making a mess; It seemed like a better choice to make, as it keeps the incontinence cleanup relatively the same, except less clothes to wash overall.
In addition, as nudity was now something people considered more normal, it would end up common for people to shower or bathe together, whether they were related, dating, or simply just friends without covering.
With this basic selection of changes in place, he made sure to set himself as aware, but that everyone else would be adjusted accordingly. With this validated, he hits apply, and the changes take effect.
Jeff's clothes vanish from his body, and a look out the window shows that everyone else is mostly naked, aside from the occasional diaper. He ends up getting an erection as he notices just what this means "Awesome, it worked!" With the changes in effect...