Dottie was designed by Moda. It uses Jelly Rolls or you can cut your own 2-1/2" x WOF strips.
The quilt in the pattern uses 36 blocks and finishes at 72" square. Since I'm not a fan of square quilts, mine finishes at 72" x 84" and uses 42 blocks. The blocks are 12" finished. The image below is from QuiltPro. I use this software to quickly test quilt sizes and block placement.