Before I studied abroad, I used to use towels only one day before washing, and wash all clothes after one wear. But while in France I learned that it's perfectly acceptable to wear the same clothes multiple times in a row without washing, plus washing is a pain the arse and expensive. Since, then I wear jeans and other pants until they are smelly, have visible dirt, or start feeling too loose and slouchy. Shirts probably 3 or 4 times unless I get really sweaty or get something on them. Sweaters, many times unless I get something on them.
Undies and socks get one use, of course. Well, I'll wear bras multiple times, but not panties.
T-shirts get two uses at most. Trousers get app. four days. Hoodies until they get really smelly or I get something on them (like ketchup... bloody ketchup). Panties and socks get one use only. Skirts until they get dirty or are otherwise not suitable for wear. Sheets get a week, and towels four days (generally, the towels get changed whenever I wash my hair - so about two times a week).
I wish they'd iron themselves though. *glances at the clothes drying in the garden* I'm going to have a lot of ironing to do tonight.
Always listen to experts. They'll tell you what can't be done, and why. Then do it.
I like to make my clothes last long so I don't wash them after one wear. Even if I spill something on it, if it's not to bad I will spot clean it. I also am hippieish and like to save water/energy/ materials etc.
underwear gets one wear
pants and shorts get one wear if I don't wear underwear, with underwear it might take 6-8 wears before I feel they need to be washed.
Shirts can be once or many times. I usually use a smell test for them.
I started this thread because I noticed, as Cze mentioned, that my clothing seems to fade and wear quickly despite not being hard on them at all. Maybe I wash my shirts too often. Or maybe I just need a lot more shirts.
I never wear shirts more than one day, and sometimes even change after work - though I don't care as much if I'm just at home, I could wear a shirt on the weekend, sat-sun. Shirts smell even with deodorant, they press against your armpits and absorb sweat all day! socks too, unless I don't take them off at night, then they don't feel gross to put on.
Pants can go a week or more, whenever I do a load of laundry (I had only one pair of jeans I wore every day, for a while. Now I have 2-3 - but a lot of shirts/socks to support my slack laundry habits). Sweaters go until they're dirty or smell (can be a while for a loose hoodie). Towels are pretty much infinite use, I wash them whenever I do a load of whites though. Skirts are also infinite, unless they;re horribly wrinkled or more commonly, spilled on.
I'm really jealous of you people whose shirts don't smell after 1+ day! I didn't know that existed...or maybe I'm just really sensitive to the smell, or really smelly myself, lol. Everyone I know in RL wears shirts only once and pants multiple times, though.
Jeans I wear quite a few times because I usually only wear them for a few hours unless they get stained. Tops get washed after one wearing.work pants,skirts,shorts get worn 2-3 times unless stained. Heavy winter sweaters get worn twice.