I have a bunch of shorts and T-shirts, mostly promotional T-shirts, that I wear all the time. Promotional T-shirts are great because if I wear them running, hiking, working, burning, whatever, it doesn't matter. If one of them gets too badly damaged to be wearable any more I retire it and move on to the next one. Many of the ones I still wear carry an assortment of marks, stains and holes. Marks and stains from the assorted things I've been working with - glue, sealant, whatever. Holes may be from being worn in the sun so many times to bugs having a go at them to burn marks if I've been grinding or getting caught on thorny branches when out hiking.
When it gets colder I wear long sleeves and long pants, albeit reluctantly.