So, I was wondering what it would take to make a script, that for every 24 hours, all the characters would change the outfits they have on.
Seriously, what game that takes place over weeks of time, has characters and NPC's that wear the same clothes
You mean real time 24 hours? If you want it to change after a certain amount of time passes in the game, you can easily event it.
Strike 1. Learn to read the goddamn rules.