Here's how to make it happen
1. Using a sharp pair of scissors, chop the sleeves off your T-shirt.
2. Using the sleeves you just cut off, cut a strip of fabric off the top of the sleeve. It should be about 2-3 inches wide, and as long as your original sleeve.
3. Take the strip of fabric you just cut and loop it around the shoulder of your shirt.
4. Lay the ends of the strip flat together and sew a straight stitch across them to form a full loop. Trim the extra fabric. (Non-sewing version: Use fabric glue to create the loop.) Twist the loop around so the seam is hidden on the inside of the shirt, and you're done.
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