12Sweatshirts. You can use the front and back of your sweatshirts if you need to. You need 12 "things" you can cut into squares. So if you use the front and the back of the sweatshirt you only need 6.
2YardsSweatshirt Fleece. The Fleece should be 58-60" wide. You can purchase sweatshirt fleece at most big box craft stores.
The finished Size is about 52" x 77"
Cut up your sweatshirts
Before you begin, prewash and dry your sweatshirt fleece backing. Also, make sure all of your sweatshirts are clean.
Separate the front of the sweatshirt from the back. Just cut up the side seams and across the shoulders. If there is a kangaroo pocket, use a seam ripper and remove it from the sweatshirt before you begin.
Center the 15 ½" ruler on the sweatshirt in the desired location and cut it out. Repeat until you have 12 squares.
Sew the Squares Together
Arrange the cut sweatshirt squares into four rows of three. I like to lay my pieces on a design wall or the floor to double-check the placement and arrangement. Stitch 3 of the squares into a row. Use a ¼" seam allowance.
Lightly press taking care not to touch any of the lettering/design on the sweatshirt with the iron. You may also want to test a scrap of fabric before you press. Some sweatshirt material will melt with heated with an iron.
Sew the rows together. When finished, you will have a grid of squares three across and four down.
Add Backing and Binding
Note: Your sweatshirt backing should have been 60" x 72" before you washed it. Since it shrinks after washing, it will no longer be 60" x 72". That is ok. There is plenty of wiggle room when constructing blankets using this method.
Find the center of all four sides of BOTH your sewn sweatshirt squares and the backing material.
Pin the sweatshirt squares to the backing, right sides facing. You want to pin from the center out. The backing is larger than the front so you will end up with funny "dog eared" pieces at the end. Remember you are pinning starting and the centers and working out.
Stich the backing to the front using a ½" seam allowance. Start sewing ½" from the edge of the front piece and end ½" from the other side. On one side leave a 12" hole to turn the blanket right side out.
Fold the blanket diagonally from corner to corner. You'll probably need to lay it out on the floor since it's so large. You want all of the layers to be right on top of each other.
Draw a line along the edge of the blanket across the "dog eared" section. A photo is attached, showing this technique on a smaller blanket. Stitch along this line. Repeat for all four corners.
Check the Corners
Turn one corner of the blanket right side out. Double-check that the corner is sewn correctly. IF it was, turn it wrong side out again and cut off the excess fabric.
Turn the blanket right side out. Pin the opening in the blanket closed — Topstitch around the entire edge of the blanket on the binding section stitching close to the seam.
For kids size sweatshirts you'll want to use a smaller ruler, probably 12 ½".