I saw a shirt tutorial on http://www.indietutes.blogspot.com/ and decided to give shirring a try. You use elastic thread to gather the fabric. The package the thread comes in is also quite helpful. In true Michelle fashion, I did not follow the directions exactly and have one major flaw. Can you see what it is? Basically, all you do is measure the chest and multiply that number by 2. Hand thread the elastic thread on the bobbin. Place matching thread on the spool and go for it. Make as many rows as you need. You do need to pull the fabric taut as you sew because it bunches up right away. Oh, and set your machine for wider stitches. (Maybe, read the directions on the thread box). It was fun and easy. I think I will try it again.