Disposable clothing are still made. Firefighters, the kind that fight forest fires quite often use disposable sleeping bags...they're made of Tyvek. And I have a good friend that's a flight attendant and she purchases disposable underwear at Walgreens...doesn't like packing THAT type of dirty laundry in her suitcase because of security going through suitcases at airports.
I've seen the coveralls and even windbreaker-type coats out of paper/Tyvek.
But I think for the longterm, disposable would be very, very expensive. Soap and water are cheap
The one thing I keep forgetting to check into are chamois-type bathing towels. A couple of years ago I met a couple (in the laundrymat) who were full-timing and they were using them. Full-timers are always looking for methods to cut down on costs and these towels worked for them. Each had one in different colors than the other so they didn't mix them up.