You know how a lot of college guys pick out their clothes? They pick up the shirts off the floor and whichever smells less bad that is the one they pick. Maybe they are onto something.
I recently started to look at my shirts and think I did nothing in it. I sat around and did nothing. It is not dirty, so why should I wash it? So it goes back in the closet. When I finally decide it is dirty, normally after two days, or a day of hard work, I put it in the laundry basket. My jeans, they take a few days before they go in there.
Laundry takes a lot of water, and energy, hence CO2, to do. If you decide to wear your clothes twice, or more, before you wash then you can cut that water and energy in half. Think about it.