Mitered Borders Miter border corners when an angled seam complements the overall design of the quilt. For multiple borders, sew strips together first and attach to quilt as one unit. Step 1. Cut 2 strips the width of the quilt plus twice the border width and 2" inches extra and 2 strips the length of the quilt plus twice the border width and 2" inches extra. Example: Width of quilt before border = 65"; width of border(s) to be added = 6" 65" + 6" + 6" + 2" = strip 79" long. Cut 2 strips 79" long (width measurement). Repeat steps for length of quilt. Step 2. Center and pin border strips in place. Start and end seams 1/4" from raw edges: backstitch to secure. Press seams toward quilt top.