When I was twelve I wore one pair of jeans for about 2/3rds of the school year. They were pretty vile by the time I took them off, and they smelled horrible, but I was twelve. When I washed them they disintegrated. RIP stinky-ass 501s. I have a few pairs of Eddie Bauer jeans that have been around since 2004 or so. They get washed every week. More than that, one particular pair was in not one, but two layovers and are doing fine. I'm not sure who these magical people are that can wear a pair of jeans for a year and not have them smell like bait? But I'm definitely not one of them and neither is my wife, who is an android devoid of sweat and scent glands. Unless you're wearing long underwear your jeans are the direct repository of half the skin cells your body sloughs off every day. And I mean, just walking around wearing a mixer all day is enough for me to sweat out a pair of jeans. I wash my clothes when they stink, which is one wearing or 4-5 for jeans. I wash my hair when it feels gross and smells bad, which is every other day. I wash my face once or twice a day which is the carefully-calculated minimum to keep myself from breaking out (at 44). When I'm in LA that becomes 2-3 times a day because of all the schmutz. I know there's this vast movement to let it mellow but I, for one, am fucking vile if I don't keep clean. I suspect I'm not alone.Once a year, or so, is all they actually need. No, seriously.
We wash EVERYTHING - clothes, hair, faces - far too often for our good, and 99% of those resources are wasted... the material, the clothing item, the detergents, the water, processing the detergents back OUT of the water at the wastewater treatment plant, etc.