Using a zigzag stitch length of about 3.0 and width of about 3.5, zigzag close to the straight stitching line.
Using the zigzag stitch as your guide, trim away the excess fabric. Press the bias strip away from the shirt.
On the wrong side, turn under the raw edge of the bias strip and pin in place. Using tiny stitches, slip stitch the bias strip in place. This will make your bias strip about 1/4" wide.
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