The Basic Method: Pinning, Basting, and Permanent Stitching
Sewing a collar onto a jacket means attaching the finished collar piece to the jacket neckline using a combination of hand-stitching and machine work. The process takes three stages: pinning the collar in the correct position, basting it with temporary stitches to hold it steady, and then sewing it permanently with a machine or backstitch. Most collars sit with the undercollar (the inner layer) facing the jacket body, and the topcollar (the outer layer) facing outward.
Start by pressing both the collar and the jacket neckline with an iron to remove wrinkles and set the fabric. This makes pinning easier and gives you a cleaner final result. Lay the jacket flat on your work surface with the neckline facing up, then position the collar so the undercollar sits against the jacket fabric. The collar points should align with the shoulder seams or the center front, depending on your jacket style.
Pin the collar in place using straight pins spaced about 1 inch apart around the entire neckline. Start at the center back and work toward each shoulder, then pin the front sections. Check that the collar sits evenly on both sides of the neckline before you move to the next step.
Key Takeaways
- The undercollar (inner layer) attaches to the jacket body, while the topcollar wraps around it to hide the seam.
- Basting with long temporary stitches holds the collar in place before you machine-stitch it permanently, preventing shifting.
- Machine-stitch the undercollar to the neckline first, then fold the topcollar over and hand-stitch it down to create a finished edge.
- Pressing the collar and neckline before you begin makes the fabric easier to work with and produces a flatter, more professional result.
- Trim seam allowances and grade the layers (cut them to different widths) so the finished collar does not bunch at the neckline.
Basting the Collar in Place
Basting means sewing with long, loose stitches that hold the fabric temporarily. Use a needle and thread in a color that contrasts with your fabric so you can see the stitches easily. Make stitches about 1/4 inch long and space them roughly 1/2 inch apart around the entire neckline. Basting keeps the collar from shifting while you machine-stitch, which is especially important if your fabric is slippery or your neckline is curved.
Baste from the undercollar side (the side facing the jacket), following the same path you pinned. Work slowly and keep the tension loose—these stitches will be removed later, so they do not need to be strong. Once you finish basting the entire neckline, remove the pins.
Machine-Stitching the Undercollar
Set your sewing machine to a straight stitch with a stitch length of 2 to 2.5 millimeters. Position the jacket under the presser foot so the needle enters the seam line between the undercollar and the jacket body. Sew slowly around the entire neckline, keeping the edge of the presser foot aligned with the raw edges of the fabric. Backstitch at the beginning and end to lock the thread.
Stitch from the undercollar side so you can see the seam line clearly and keep your stitches straight. Stop occasionally to lift the presser foot and reposition the fabric, especially at curves and corners. Once you finish stitching all the way around, remove the basting stitches by gently pulling the thread and sliding a seam ripper under each stitch to cut it.
After removing the basting, trim the seam allowances to about 1/4 inch from the stitching line. Grade the layers by cutting the jacket seam allowance slightly shorter than the collar seam allowance—this prevents bulk when you fold the topcollar over. Clip into the seam allowance at curves and corners (small cuts perpendicular to the seam) so the fabric lies flat when you fold it.
Folding and Pressing the Topcollar
The topcollar is the outer layer that wraps around the neckline seam to hide it. Fold the topcollar down over the seam you just stitched, so the folded edge of the topcollar covers the machine stitching. Press this fold with an iron to set it in place. The topcollar should sit smoothly without puckering or pulling.
Pin the topcollar in place along the neckline, working from the inside of the jacket. The pins should hold the folded edge of the topcollar just over the machine stitching line. Space the pins about 1 inch apart and check both sides to make sure the topcollar sits evenly.
Hand-Stitching the Topcollar
Thread a needle with thread that matches your jacket fabric. Use a slip stitch (also called a ladder stitch or invisible stitch) to sew the folded edge of the topcollar to the jacket. A slip stitch runs inside the fold of the fabric, so the thread does not show on the outside. Bring the needle up through the fold, then insert it directly across into the jacket fabric, run it forward about 1/4 inch inside the jacket, and bring it back out through the fold. Repeat this motion all the way around the neckline.
Keep your stitches small and tight—about 1/8 inch long—and maintain even tension so the thread does not pucker the fabric. Work slowly and check your progress frequently. Once you reach the starting point, tie off the thread on the inside of the jacket by making a small knot and running the needle through a few stitches before cutting the thread.
Finishing the Collar Ends
The ends of the collar (where it meets the front edges of the jacket) need to be sewn closed. Fold the front edge of the jacket and the collar end together so the raw edges meet, then pin them. Machine-stitch or hand-stitch along this edge using a 1/4-inch seam allowance. Trim the seam allowance and turn the collar end right-side out by pulling it through the opening.
Press the collar end flat with an iron, then slip-stitch the opening closed using the same technique you used for the topcollar. This creates a finished edge that looks professional and prevents the collar from fraying.
Pressing and Final Details
Once all the stitching is complete, press the entire collar with an iron set to the appropriate temperature for your fabric. Use a pressing cloth (a thin piece of cotton or linen) between the iron and the collar to prevent shine or damage. Press from the inside of the jacket first, then flip it over and press the outside. Pay special attention to the neckline seam and the collar points.
Check that the collar sits evenly on both sides of the neckline and that the topcollar completely covers the machine stitching. If you see any puckering or uneven spots, you can carefully remove a few stitches, adjust the fabric, and re-stitch. A well-sewn collar should lie flat and smooth without any visible stitching on the outside.
Frequently Asked Questions
What is the difference between the undercollar and topcollar?
The undercollar is the inner layer that attaches directly to the jacket neckline. The topcollar is the outer layer that folds over the seam to hide it and create a finished edge. Both pieces are cut from the same pattern, but they are sewn separately so the seam stays hidden.
Can I sew the collar on by machine only, without hand-stitching?
Yes, you can machine-stitch the topcollar down instead of hand-stitching it, but the stitching will be visible on the outside of the jacket. Hand-stitching creates an invisible seam that looks more professional and is standard on tailored jackets. If you choose to machine-stitch, use a thread color that matches your fabric and stitch very close to the folded edge of the topcollar.
What should I do if the collar is puckering or pulling?
Puckering usually means the seam allowance is too wide or the fabric was not clipped at curves. Remove the stitches, trim the seam allowance narrower, clip into the curves more deeply, and re-stitch. You can also try pressing the area with steam to relax the fabric before re-stitching.
How do I keep the collar points sharp and crisp?
Press the collar points with an iron before you attach the collar to the jacket, and press them again after all stitching is complete. Use a pressing ham or a rolled towel under the point to support it while you press. Avoid pressing too hard, which can flatten the fabric and make it shine.
Do I need to use a pattern to cut the collar pieces?
Yes, a pattern ensures the collar pieces are the correct size and shape for your jacket. If you are replacing a collar on an existing jacket, you can use the old collar as a pattern by laying it on paper and tracing around it. If you are making a new jacket, use a commercial sewing pattern or draft your own collar based on your neckline measurement.