Here's how I did it.
I started out with the tee shirt and then trimmed the neckline.
Then I cut away the arms.
After I cut one off, I used it as the pattern for the other arm.
Then I ironed down the seams where I wanted to stitch them.
And the shirt and bag were done.
Simple sewing to turn something I wouldn't use into something I definitely will use and my husband will too.