Understanding these life spans, and therefore getting the maximum amount of wear out of your clothing, is essential to survival. Being the nice guy that I am, I will now relay the immense knowledge that I have in the area of clothing life spans. First, start at the top with shirts. Shirts are in relative abundance compared to other garments. They can be bought cheaply at nearly any type of store anywhere.
Shirts only go a day under normal circumstances.
The fact that they hang up there by those massive sweat glands under our arms almost ensure that shirts are spent after one day of wear. Also, being that your shirt is often the key element of your look for the day, it is really nice being able to wear one that is clean. The exception is shirts that are worn over other shirts. Depending on if they are needed, these shirts could be recycled. Barring any major stain causing accidents, pants can go for a week.