Clothing has a condition value attached to it. A brand new t-shirt / shorts will be rated as "Pristine" and through time, it's quality will deteriorate until (if you wear it long enough), it will resemble a mechanic's rag.
From lowest to highest, the values are as follows.
Magic white t-shirt/shortsEdit
The only items of clothing that do not decrease in quality are the magic white t-shirt/shorts.