Hi to all! I worked on a cute toddler knit top pattern yesterday that had a gathered strip (about 4 inches) along the bottom of the tee-shirt, and also puff sleeves. I used my ruffler foot on the gather across the bottom as it did seem to gather 2:1 ratio which was what worked for the pattern, but it just does not seem very "ruffly" and I figured that was because it is knit fabric. Also, I can do like Margaret Tully says on the sleeves that require just a little ease, serging normally until I get to the notches where I need to gather, and then changing the diff feed a couple of notches to gather for the top portion of the sleeve cap, and then once I hit the final notch, I change my diff feed back to normal. For the puff sleeve, this technique didn't work as it did not gather enough the sleeve cap and the sleeve hem where the sleeve band went (seems that may need more of a 3 or 4:1 ratio). Will just do that gathering on the sewing machine and then attach the sleeve to the garment on the serger, unless anyone has any other tips to share.
Also, the lettuce edge hem turned out well, no pokies! Used a 3-thread wide overlock stitch this time leaving the left needle in. The wide lettuce edge is cute on toddler clothes.