In this tutorial, I will show you how to sew an over the collar dog bandana using a 10" x 10" piece of cotton fabric. This is a basic sewing project that is great for beginners. 6" x 6" corner fold 1 1/2" 8" x 8" corner fold 2" 10" x 10" corner fold 2 1/4" 12" x 12 " corner fold 2.5" 15" x 15" corner fold 3"