I have a winter coat from when I was 16 that still works great. Ditto for a leather jacket. These are both 25 years old. I even have some old leather hiking boots from that era too that are still in decent shape. I pretty much wear jeans until they disintegrate and they probably only do that due to washing.. the Levi guy said to not wash your jeans ever...
Jeans will wear out from never being washed, too. Dirt, grime and dust collects between the fibers and abrade them.
Obviously don't wash your jeans every time you wear them, but once a month if you wear them all the time is fine. Low temperature, gentle cycle, never tumble dry because that really wears out fabrics fast. Consider using liquid wool detergent, since it's more gentle and doesn't have abrasive particles.
Another good tip is to wear clothes on alternate days, and let them hang to air out between wears. Give them a good shake before putting them on, that takes care of a lot of dry dirt and dust, reducing abrasion.
Steaming works really well for wool and wool blends, for freshening up items that are nominally dry clean only. A clothes brush and a steamer can put off the need for dry cleaning for a long time. Spot cleaning takes care of actual stains and steaming loosens the fibers so they release a lot of the dirt stuck to them. Plus it should kill off most of any bacteria, too.
And don't buy Levi's, their quality is mediocre now.
