Step 7Glue!
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Turn the shirt inside out and use the fabric glue to hem up the cut edges. To do this, put some glue down on the fabric a little ways away from the edge and then fold the edge over the glue so that the cut edge is now on the inside of the shirt. press the fabric and glue together until they set enough to stick together on their own. If you're having trouble getting some to stay together on their own, try pinning them together until they stick. You may have to do this in stages so that the glue will have time to dry. Also, for reasons that will become clear in the next step, it's not necessary to put a hem on the left and right edges of the stomach side (but don't forget to put one along the bottom edge.
If you prefer, you can use the needle and thread for this, or a sewing machine if you have one. I would just make a mess if I tried that, so I went with the much safer route of the fabric glue.