Don't do it. You can recycle that old tee. You can make a comforable cushion out of it.
With your trusty needle, thread and scissors, you can sew up t-shirt to create a new cushion. Then you can plump up that cushion by stuffing it with another old t-shirt.
Step 1 Turn that old t-shirt inside out. You want the seams to be hidden from sight. By turning the t-shirt inside out, the seams you sew will be hidden when you invert the t-shirt later.
Step 2 Sew the bottom of the t-shirt shut. You create the bottom seam of the cushion by sewing right across the middle of your t-shirt parallel to the hem, and back again to make sure that seam is strong. The excess fabric from the middle of the t-shirt to the hem would be used as stuffing once you invert the t-shirt at a later stage.
Step 3 Sew the sleeves to close them up Sew the sleeves shut from the sides of the t-shirt right up to the shoulder, closing the arm hole completely.
Step 4 Turn that tee the right way round. Put your hand through the neckline and pull the t-shirt inside out again, to invert it. The excess fabric will stay in the cushion as filling. You should get a rectangular cushion.
Step 5 Sew the neckline and you're done. Sew that neckline shut with needle and thread.
Now you have a comfortable cushion made up of your old tees. You can decorate this new cushion whichever way you want. You can sew sequins, draw on it with a fabric pen, embroider the cushion.. whichever way your creativity takes you.
Now that you are short of 2 t-shirts, you might want to buy t-shirts at http://www.buy-t-shirts.net to replace your old t shirts.
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