A mitered border is a more time consuming corner to make, but one that adds a quality look where your angled seem comes together in a 45-degree angle. This mitered corner technique becomes easier and easier as you do a few and is well worth the finished look. In this book I have used different corner and border techniques. I have done that so you, the reader can see the distinct difference that a mitered corner makes.
Calculating your strips for a mitered corner is similar for measuring for a non mitered corner or border. Length plus width of the border times 2 plus 16” for the total amount of length needed in the size needed. So, to get this number, again, measure the length times width times two and add 16” for seam allowance because you are cutting this length into four pieces and you need 2” on each side to miter. Again, this is the total amount of fabric needed. I recommend measuring your quilt on both sides and width in a few different places to make sure your quilt is square and thus you do not run short on your border fabric.
Cut two strips to be 4” longer than the width of your quilt. Cut two strips the length size of your quilt plus four inches each.
Fold your strips in half and put a pin in the center of each strip.
If you are using multiple borders do this for each border and then starting at your center pin, sew these strips together.
Place a pin in the center of your completed borders. Place a pin in the center of all four sides of our quilt. You can do this by measuring or by folding your quilt in half and placing the pin in the completed top of your quilt. Match these pins letting the extra border length lap over the ends.
Double check your quilt center by folding the quilt top in half and verify your centers. Now fold your border fabric in half and verify your centers.
Pin the center of your first length piece to the center of your quilt length mark so now your border and your quilt top center are connected. Begin your sewing at the center pin and sew out toward the edge. Leave ¼” away from the edge of the quilt top un-sewn. Make sure to secure the ends solidly by a back stitch or three. Sew the complete strip on leaving your ¼ inch away from each edge. Do this with all four borders, leaving the end fabric of two inches on each side overlapping.
Fold the quilt top in half diagonally with right sides together. Line up the two borders, on top of each other with the fold running at a 45-degree angle between the two. Put your triangle square on the 45-degree angle over your quilt and out on the border fabric that extends out. Use your pencil or water soluble ink to make your visual mark to follow out onto the border and pin the border pieces and quilt into place.
Now sew your corner over the line that you created with your ruler. Make sure to lock your start and finish with a back stitch or two on either side of your angled border.
Unfold your quilt make sure your borders lie flat and you have no spaces in your quilt or border that is not firmly stitched together.
Trim your border to 1/4″ seam and iron.
Do this same method for the other three corners.
Congratulations you have mitered corners and it was easy!
