Because t-shirt fabric is stretchy, it's really easy to make ruffles. Just stretch the fabric out at the sides while pushing it forward at the same time. The result is the perfect T-shirt fabric ruffles without having to mess around with pulling threads, pinning or gathering.
Tips for sewing ruffles. She gives multiple suggestions for gathering--one is using cording and another using zigzag over dental floss. Why have I never thought of this? Tons nicer than breaking a hundred threads trying to do it the "correct" way.
I have an easy way to Gather Fabric that will give you even gathers. Even better, you will not have any broken stitches or tangled threads. This easy way to gather fabric is a perfect sewing tip to remember when gathering a large strip of fabric for a ruffle.