- 1). Lay the shirt on a clean surface and smooth or iron out any wrinkles.
- 2). Measure about 1 1/2 inches inward from each shoulder seam. This is where the sleeve is joined to the shirt. Make a small mark on the fabric.
- 3). Draw a narrow curve across the front of the shirt, from one mark to the other with tailor’s chalk. The depth of the neckline should not change much, just the width of the neckline.
- 4). Cut across the curved line with a sharp pair of scissors. Try on the shirt to make sure the neck is wide enough for your preference.
- 5). Lay the shirt on your work surface and measure the distance from one shoulder seam, across the back of the neckline, to the other should seam. Cut a piece of coordinating 1/4- or 1/2-inch bias tape to this length.
- 6). Lay one short end of the tape over the top of one shoulder seam and pin it in place. Smooth the tape across the remainder of the shoulder of the shirt and insert pins. Open the layers of the tape and slide the back of the neckline in between the layers. Pin it in place and continue along the neckline in the same manner. Lay the remainder of the tape on top of the other shoulder to the seam.
- 7). Measure the length of the front of the neckline. Cut another piece of bias tape to this length. Open the layers of the tape and slide the front neckline into the tape. Pin it in place.
- 8). Sew a straight stitch all the way along the bias tape to join it to the shirt.
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