Why are collars interfaced?
Applying interfacing to the upper collar will prevent the seam allowance from showing through on the right side of the finished collar. Sew-in interfacing be sewn in place when the collar is staystitched. After staystitching the interfacing, trim the interfacing close to the stitching.
What is a flat collar?
It has a buckle or plastic snap (“quick-release”) closure and a ring for attaching identification tags and leash and is available in many colors and designs. A flat collar should fit comfortably on your dog’s neck; it should not be so tight as to choke your dog nor so loose that they can slip out of it.