Why are there so many science fiction worlds where people wear unisex jumpsuits?

I’ve wondered why the inhabitants of alien worlds in Star Trek and some other science fiction are depicted all wearing some kind of unisex, one-piece coverall. Other than keeping down the cost of production of the film or TV episode, what could be a legitimate backstory for how a society comes to adopt this mode of dress? I used to think that the basis for a cultural transition to such stereotypically futuristic, unisex one-piece coveralls was going to be the security theater of airline travel because those outfits would facilitate the ease of safety inspections and body scans. Now I think it’s more likely that the cyclical occurrence of pandemic viruses would be the basis for a society’s transition to such clothing. These coveralls would be disposable, recyclable, or easily disinfected. Perhaps they would be 3D printed at home. Printing would be more economically and environmentally sustainable, as it would eliminate the costs and fuel consumption of long-distance supply chains that are also at risk of interruption during a global pandemic. Eventually, a system of color-coding of the coveralls for essential industries or jobs would develop; white for healthcare, green for food, gray for transportation, blue for law enforcement, etc. Initially, the outfits would also include printed, attached hoods, gloves, goggles, and face masks. Eventually, these additional elements would be omitted. And that’s how alien worlds end up with the inhabitants all wearing the same style of clothing. Like Comment Share