The basic steps for attaching a coat collar
A coat collar is sewn in two stages: first you stitch the collar pieces together and turn them right-side out, then you attach that finished collar to the coat neckline. The collar sits between two layers of fabric at the neck — the coat body and a facing piece — so the facing holds it in place permanently. The key is stitching the neckline seam through all three layers (coat, collar, facing) in one pass, which locks the collar so it cannot slip or rotate.
Most coat collars are cut as two identical pieces from fashion fabric, interfaced on the underside to add structure. You sew those two pieces together around three sides, leave the fourth side (the neckline edge) open, turn the collar right-side out through that opening, press it flat, and then topstitch the open edge closed. After that, the collar is ready to attach to the coat.
The actual attachment happens when you sew the facing to the coat neckline. The collar sits sandwiched between the coat and facing, and the single seam that joins them holds everything in place. If you sew this seam correctly — with even tension and a straight line — the collar will stay put and lie smoothly against the coat.
Key Takeaways
- Sew the two collar pieces together on three sides, turn right-side out, press, and topstitch the neckline edge closed before attaching to the coat.
- The collar attaches to the coat by being sandwiched between the coat body and the facing, held in place by a single neckline seam.
- Baste the collar to the coat neckline before sewing the facing on, so the collar stays in the correct position while you work.
- Press the finished collar after attaching it so it lies flat and the seams roll to the underside where they are less visible.
- If your collar twists or gaps, the problem is usually uneven tension in the neckline seam or a collar that was not pressed before attachment.
Prepare the collar pieces with interfacing
Before you sew anything, explore interfacing to the underside of one collar piece. Interfacing is a layer of stiffening fabric that you fuse to the wrong side of your fashion fabric using heat and pressure. It prevents the collar from drooping and gives it a crisp edge. Use a medium-weight interfacing for most coats — it is firm enough to hold shape without making the collar stiff and uncomfortable.
Cut your interfacing to the same size as your collar piece, place it on the wrong side of the fabric, and fuse it according to the interfacing package instructions. Most interfacing requires a hot iron held in place for 10 to 15 seconds. Let it cool before you move the fabric, so the bond sets properly. You only interface one piece — the piece that will be the underside of the finished collar — because interfacing on both sides makes the collar too thick and bulky at the seams.
Sew the collar pieces together and turn them right-side out
Place the two collar pieces with right sides together (the pretty sides facing each other). Pin around three sides: the two long edges and one short end. Leave the fourth side — the neckline edge — unpinned and open. This opening is how you will turn the collar right-side out after sewing.
Sew around the three pinned sides using a 5/8-inch seam allowance, which is standard for coat construction. Backstitch at the beginning and end of each seam to lock the stitches. Trim the seam allowance to 1/4 inch to reduce bulk, and clip the corners diagonally (cut off the corner triangle without cutting into the stitches). These steps make the corners sharp and neat when you turn the collar right-side out.
Turn the collar through the open neckline edge by reaching in and pulling one corner out first, then working the rest of the fabric through. Use a point turner or the blunt end of a chopstick to push the corners out fully so they are crisp and square. Press the collar flat with a hot iron, paying special attention to the edges so they are sharp and even. Once pressed, topstitch around the three sewn sides, about 1/8 inch from the edge. This topstitch closes the neckline edge and adds a professional finish.
Baste the collar to the coat neckline
Before you attach the facing, the collar must be pinned or basted to the coat neckline so it stays in the correct position while you sew. Basting means sewing with long, loose stitches that hold pieces together temporarily — you remove them later. Hand-baste using a needle and thread, or use your machine on the longest stitch length.
Pin the collar to the coat neckline with the neckline edge of the collar aligned with the neckline edge of the coat. The collar should sit between the coat and the facing, so the neckline edges must line up exactly. Baste around the entire neckline using 1/2-inch stitches. This keeps the collar from shifting while you sew the facing on. If the collar moves during the facing seam, it will twist or gap when you wear the coat.
Attach the facing to lock the collar in place
The facing is a piece of fabric cut to the same shape as the neckline and armholes. It is sewn to the coat on the inside, and it is what actually holds the collar in place. Pin the facing to the coat neckline with right sides together, so the collar is sandwiched between the coat and facing. The collar's neckline edge should be caught in the seam you are about to sew.
Sew the facing to the coat using a 5/8-inch seam allowance, sewing through all layers: coat, collar, and facing. Use a steady, even pace and keep the seam line straight. Backstitch at the beginning and end. Once you sew this seam, the collar is permanently attached and cannot move.
Trim the seam allowance to 1/4 inch and clip the curves so the seam lies flat when you turn the facing to the inside. Press the seam from the inside of the coat, using a pressing ham or rolled towel under the neckline so you do not create unwanted creases. The seam should roll slightly toward the facing side so the stitches are hidden on the inside of the coat.
Press and finish the collar after attachment
After the facing is sewn and turned to the inside, press the entire neckline area from the outside of the coat. Use a hot iron and a damp pressing cloth to set the seams and make the collar lie smoothly. Press from the coat side, not the facing side, so the seams roll toward the facing where they belong.
If your pattern includes a topstitch on the facing (a visible line of stitching on the inside), sew it now, about 1/4 inch from the neckline seam. This topstitch holds the facing in place permanently and prevents it from rolling to the outside. It also creates a professional, finished look.
Remove the basting stitches by pulling the thread gently — they should come out easily. If they are stuck, use a seam ripper to cut them every few inches, then pull them out. Once the basting is gone, your collar is complete and ready to wear.
Troubleshooting a collar that twists or gaps
If your finished collar twists to one side or gaps away from the coat, the problem is usually one of three things: uneven tension in the neckline seam, a collar that was not pressed before attachment, or a neckline seam that is not straight. Uneven tension means you sewed faster on one side than the other, which pulls the fabric unevenly. Sew slowly and steadily around the entire neckline, keeping the same speed throughout.
A collar that was not pressed before attachment will not lie flat because the fabric has memory — it remembers the shape it was in before you sewed it. Always press the finished collar thoroughly before basting it to the coat. If the neckline seam itself is crooked, the collar will follow the curve of that seam and twist accordingly. Practice sewing a straight line by following the presser foot guide or using a seam guide attachment on your machine.
If the collar gaps at the front or back, the problem may be that the collar was not basted evenly around the neckline. Some parts were held in place better than others, so they caught in the seam differently. Next time, baste more frequently — every inch or so — so the collar cannot shift.
Frequently Asked Questions
Can I attach a collar without a facing?
No, a facing is what holds the collar in place. Without it, the collar would be loose and would shift when you wear the coat. A facing is a standard part of coat construction and is necessary for a collar that stays put.
What if I sewed the collar on backwards?
If the interfaced side is facing outward instead of inward, you can carefully remove the facing stitches with a seam ripper, flip the collar to the correct side, and re-sew the facing. It is tedious but fixable. To avoid this, always mark which side of the collar is the underside before you start sewing.
How do I make the collar stand up instead of lying flat?
A collar that stands up requires a stiffer interfacing and a different pressing technique. Use a heavy-weight interfacing instead of medium-weight, and after sewing the facing, press the collar upward and away from the coat neckline rather than downward. Some patterns also include a stand — a separate piece of fabric between the collar and the neckline — which creates height.
Should I topstitch the neckline seam on the outside of the coat?
Most coat collars do not have a visible topstitch on the outside neckline seam — the stitches are hidden inside the coat. However, if your pattern calls for it, topstitch about 1/4 inch from the neckline seam on the outside of the coat for a decorative effect. This is a design choice, not a structural requirement.
What is the difference between a collar and a stand?
A stand is a separate strip of fabric sewn between the neckline and the collar. It creates height and makes the collar stand away from the neck. A collar without a stand is sewn directly to the neckline and lies flatter. Stands are common on tailored coats and formal wear.