undies are only worn once as are "undershirts" or t-shirts worn right next to my skin.
Jeans...well, especially in winter when I'm not sweaty I can go a week because I generally take them off right as I get home from work and put on jammy pants.
Jammies, about 2x per week i put on a new set. Overshirts can get worn twice if they are aired out between and it wasn't a sweaty day at work.
Socks...with smartwool socks I can wear them 2 or 3 times when I'm camping/hiking/working, but again, taken off and aired well between wearings. Other socks only get one wearing.