[McheleM]

Originally Posted by kjc

The Ruffler attachment is capable of making a much fuller gather and does pleats. The Gathering foot gives a gentle gather.



From: Blog | How to Estimate Fabric for use with your Ruffler foot | Sewing Machines Etcetera

Estimating Fabric
To determing the ratio of the fabric to the finished length of the ruffle, measure the ruffle strip before and then again after gathering.

Procedure
Cut a 20" test piece of fabric to be gathered. Cut it the same width the actual ruffle will be. Make a mark 5" in from each end. That leaves 10" in the middle which is the "test area". Gather the entire 20" length of fabric using the stitch length and tension that you want. Once it is gathered, make a note of the machine settings used and measure the gathered "test area". For example, if it is now 6", you'll end up with 6" of ruffle for every 10" of flat fabric that you start with. Divide the length of ruffle needed (let's say 300") by the length of the gathered "test area" (6" in this case) and multiply the result by 10. Example: 300" of ruffle is needed. 300 divided by 6 = 50. 50 x 10 = 500. So a 500" flat strip is needed in order to end up with a 300" gathered strip.



How to use the Ruffler Foot - YouTube

Thank you for this!!