I found this T-shirt at goodwill also. Although it would have made a cute shirt for me, I've been wanting to make shorts for my son. So this striped T became shorts tonight! 20 minutes total, (not counting the time it took me to find the tutorial I had bookmarked.)
New shorts that just need the elastic put in.
The vertical striped shorts are the ones I used as a pattern. I'm afraid the ones I made may be a bit short in the waist, but we'll find out. If they are, I have some left-over blue T-shirt material that can be the cuffs and the waist. I'll make it work!