2. If it is close to the seam of the clothes, you can also disassemble the seam of the hem of the clothes and put it in with a sewing machine. But the waist is small, so do the stitches, unless the waist of this shirt is too big for you.
If the clothes are not expensive, there is no need to do professional darning. Line the back with a small piece of cloth and step on a few stitches with a sewing machine.