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Cut your fabric pieces so that they are the desired dimensions for your blanket including 1in (2.5cm) added to the length and width for the seam allowance. Then, place them together so that the right sides are facing each other. Pin along 3 of the edges. Place pins about 2 to 3 inches (5.1 to 7.6cm) apart to secure the edges. Insert the pins so that they are perpendicular to the raw edges of the blanket.
Align and pin the fabric pieces with the right (print) sides facing each other.