Question: To make a no sew shirt out of an old shirt.
Options:
Find an old shirt you no longer wear, then cut off the sleeves, fold the fabric under and use seam tape to hold new sleeves in place.
Find an old shirt you no longer wear, then cut off the sleeves, fold the fabric under and use paper clips to hold new sleeves  in place.
Answer: Find an old shirt you no longer wear, then cut off the sleeves, fold the fabric under and use seam tape to hold new sleeves in place.