How often do you wash your pair of jeans? Well, have you ever washed your jeans?
I'm not sure about other countries, but some Japanese people really love old jeans and they NEVER wash it. They say that washing gives a lot of damage to the cloth and makes the color comes off.
On a pole on Yahoo Japan, people left comments about it and judging from those comments, 15% of them wash it each time they wear it, 15% of them wash it once in a week, 30% of them wash it once in 1-3 months, 30% of them wash it when they feel it becomes dirty, 10% of them never wash it.
Wow.
I don't wear jeans, so I never thought about it but maybe I would wash it every 3-4 time I wear it. It takes pretty long to dry the jeans (drying machine is not, so i would not wash it each time I wear it... too lazy? XD