How to do it
Turn T-shirt inside out and pin bottom of the T-shirt along the hem. Using a sewing machine, sew bottom of T-shirt closed. Flip shirt right side out and lay flat on table, making sure all seams are lined up.
Place medium-size bowl about half-way over the neck hole. Using a water-erasable marking pen, trace along the edge of the bowl. Cut along the outline, making sure to go through the front and back sides of the shirt, in order to create an opening for the bag that's larger than what the neck hole allows.
Line up the hems on the front and back side of the sleeve and cut, making sure to go through both sides of the shirt. Repeat on the other sleeve. Tip: A jersey shirt would also work well for this craft, as it is already sleeveless, and it's made of a great mesh material.