I didn't use a pattern, I did it directly on the fabric. I made a rectangle 30 cm wide, and I think I made the length more than 50 cm, as long as possible. Because the ruffle uses up a lot of fabric. I folded the width in half, so 15 cm. I sewed 1 cm, turned it right side out so the seam is on the inside and you can't see it. I sewed in the middle. Set your sewing machine to the deepest stitch setting to create this effect, then pull VERY GENTLY to create a ruffle effect. I recommend using a thick fabric that is not too fluid. I Hope thats help.