It'd be cool if there was a service that took old clothing, stripped them all down to the threads or whatever (idk anything about fashion - I wear the free t shirts I get at conferences lol), and make really cool clothing from that. When you're bored you can return the clothing (doesn't matter if its ripped) and it gets re-used to make the next season's fashion. You could even partner with locals all around the world who could use the economic opportunity and work on making truly global clothing that incorporates all the beautiful traditional clothing and customs too.
It could be a bit premium service too, I'm sure some of the highly paid professionals would be totally on board to try it as it scales.
All in one platform, I'll help code it. If it already exists, let me know the name.