Cut 17" muslin circle, marked a spiral in with 1" spacing, and cut 1 yard of plaid into 2 1/2" strips.
Sewed all strips together and used my rolled hem presser foot (this is another new discovery) to hem one side of the plaid strips.
Used my ruffler (imagine me saying this with pretty-close-to-jazz-hands) to sew the strips onto the spiral marked on the muslin. This was not an easy task... Now - take a moment to really look at this ruffler foot. It's a little intimidating. It has moving parts. You can choose whether to gather every stitch, every 6, or every 12. You can also choose how full you want the gathers to be. For this project I gathered every stitch with a medium fullness.