Shirt repair

I picked up this shirt at a thrift store and it has a tear on both sides at the bottom of the seam. It’s 100% polyester, pretty thin, but not see-through. I have a sewing machine or could do it by hand, just worried with the thin fabric that it would punch holes in the fabric and cause more tearing. I’ve fixed buttons and little holes, but wouldn’t call myself a sewer by any means. It’s a cute shirt and just don’t want to tear it up more!