The basic process: pin, baste, then stitch
Sewing a collar onto a shirt means attaching the finished collar piece to the neckline opening using a sewing machine or needle and thread. The collar sits between two layers of fabric at the neck — the outer shirt body and an inner facing strip — so the stitching holds all three layers together and keeps the collar from shifting.
The standard method has three stages: pinning the collar in place, basting it with loose temporary stitches, then sewing the permanent seam. This order prevents the collar from twisting or bunching as you work. Most home sewers use a sewing machine for the final seam because it produces a stronger, more even line than hand-sewing, though hand-sewing works if you have the time and a steady hand.
The whole process takes 30 to 45 minutes once your collar piece is finished and your shirt body is ready. If you are new to sewing, expect the first collar to take longer — closer to an hour — because you will be learning the feel of the fabric and the machine.
Key Takeaways
- A collar sits between the outer shirt and an inner facing, so you stitch through all three layers at once to hold everything in place.
- Pin the collar to the right side of the neckline first, matching the center marks and corners, then pin the facing on top before stitching.
- Baste with long, loose stitches by hand or machine before the final seam so you can adjust the collar if it twists.
- Stitch the seam at 5/8 inch from the edge using a straight stitch, then trim the seam allowance and press it flat before turning the facing to the inside.
- Topstitching — a visible line of stitching near the edge — holds the facing down and is optional but makes the collar look more finished.
Prepare the collar, shirt body, and facing before you start
Before you pin anything, make sure three pieces are ready: the collar itself (already sewn into a tube and turned right-side out), the shirt body with the neckline cut to size, and the facing strip that will cover the seam on the inside of the neck.
Press the collar flat with an iron so it lies smooth and the seam is centered on the underside. Press the neckline seam allowance of the shirt body — the raw edge that will be hidden — so it is crisp and straightforward to work with. If your pattern includes a separate facing piece, press that too. A pressed collar and neckline make pinning much easier because the fabric stays where you put it instead of shifting as you work.
Mark the center point of the collar with a pin or a small chalk mark on both the top and bottom layer. Mark the center of the shirt neckline the same way. Also mark the shoulder seams on both the collar and the neckline so you know where they should line up. These marks are your guides — they keep the collar from twisting as you pin.
Pin the collar to the neckline with the right sides facing
Lay the shirt flat on your work surface with the right side (the outside) facing up. The right side of the collar should face down, touching the right side of the shirt. This seems backwards, but it is correct — you are stitching with the collar and shirt inside-out, then you will flip the facing over to hide the seam.
Start at the center back of the neckline. Place the center mark of the collar on the center mark of the shirt neckline and pin them together. Then pin the shoulder seams of the collar to the shoulder seams of the shirt. These two anchor points keep the collar from sliding as you add more pins.
Pin around the neckline from one shoulder to the other, spacing pins about 2 inches apart. The collar should lie flat against the shirt with no wrinkles or puckers. If you see a pucker, remove the pins in that area, smooth the fabric, and re-pin. Puckers now become permanent wrinkles in the seam, so take the time to get this right.
Baste the collar in place with loose temporary stitches
Basting means sewing with long, loose stitches that hold the pieces together but are straightforward to remove later. You can baste by hand with a needle and thread, or use your sewing machine set to the longest stitch length. Hand-basting takes longer but gives you more control; machine-basting is faster but requires you to be comfortable guiding fabric under the presser foot.
Stitch around the entire neckline, staying about 1/2 inch from the edge. This is far enough from the edge that the basting stitches will be removed before the final seam, so they do not show. Sew slowly and stop every few inches to check that the collar is still lying flat and the layers are not bunching underneath.
Once you have basted all the way around, try the shirt on or hold it up to check the collar position. If the collar twists or sits crooked, you can remove the basting stitches and re-pin that section without damaging the fabric. This is why basting exists — it is your safety net before you commit to the permanent seam.
Stitch the collar to the neckline at 5/8 inch seam allowance
Set your sewing machine to a straight stitch with a stitch length of 2.0 to 2.5 millimeters — a standard setting on most machines. Use thread that matches your shirt fabric. Sew along the neckline, keeping the edge of the presser foot aligned with the 5/8-inch mark on the needle plate, or use a seam guide if your machine has one. This distance from the edge is the standard seam allowance for shirt collars.
Sew slowly and keep tension even — do not pull the fabric toward you or push it away. Let the machine feed the fabric. Stop and remove pins as you approach them; do not sew over pins because they can break the needle or damage the machine. Sew all the way around the neckline, including the small curved sections at the front shoulders.
When you reach the end, backstitch three or four stitches to lock the thread. Remove the shirt from the machine and clip the thread. Now remove all the basting stitches by gently pulling the loose thread — they should come out easily.
Trim the seam allowance and press it flat
The seam allowance — the fabric between your stitching line and the raw edge — needs to be trimmed so it does not create a thick, bulky ridge under the facing. Use sharp fabric scissors to trim the seam allowance down to 1/4 inch all the way around the neckline. Trim close to the stitching but not so close that you cut the thread.
At the curves and corners, clip small notches into the seam allowance without cutting the stitching. These notches let the fabric curve smoothly when you flip the facing over, so the collar sits flat instead of puckering. Clip about every 1/2 inch around the curve.
Press the seam flat with an iron, pressing from the shirt side so the seam allowance lies toward the facing. This flattens the stitches and makes the next step easier. A flat, pressed seam is the difference between a collar that looks homemade and one that looks professional.
Fold the facing to the inside and stitch it down
The facing is the strip of fabric that covers the seam on the inside of the neck. Fold it over the seam allowance so the raw edge of the facing is hidden and the facing lies flat against the inside of the shirt. Pin it in place so it does not shift as you work.
You now have two choices: hand-stitch the facing down using a ladder stitch (also called an invisible stitch), or machine-stitch it using a technique called topstitching. Hand-stitching is invisible but takes 15 to 20 minutes. Topstitching is faster — about 5 minutes — and creates a visible line of stitching 1/4 inch from the edge of the collar, which is a common design detail on store-bought shirts.
If you topstitch, sew from the outside of the shirt, stitching through the collar, seam allowance, and facing all at once. The stitching line should be parallel to the edge of the collar and about 1/4 inch away from it. This holds the facing permanently in place and gives the collar a finished look.
Frequently Asked Questions
What if the collar twists or sits crooked after I stitch it?
If you notice the twist before you remove the basting stitches, remove those stitches in the twisted area, adjust the collar, and re-baste. If you have already removed the basting and stitched the final seam, you can carefully cut the stitches with a seam ripper and re-stitch, but this is time-consuming. This is why basting and checking the fit before the final seam matters — it prevents this problem.
Can I hand-sew the collar instead of using a machine?
Yes. Use a backstitch, which is stronger than a running stitch, and sew along the same 5/8-inch line you would use on a machine. Hand-sewing takes 45 minutes to an hour for a full neckline, but the result is just as strong if your stitches are even and tight. Many people hand-sew collars on delicate fabrics because they have more control.
Do I have to topstitch the facing, or can I just hand-stitch it?
Hand-stitching the facing is fine and is invisible from the outside. Topstitching is optional and is purely a design choice — it makes the collar look more finished and is common on casual shirts, but it is not necessary for the collar to stay in place. Choose whichever method you prefer.
What thread should I use?
Use all-purpose polyester or cotton thread that matches your shirt fabric as closely as possible. If your fabric is a solid color, match that color. If your fabric is a print, match the dominant color. Thread that is too light or too dark will show in the seam and topstitching.
How do I know if my seam is strong enough?
A properly sewn collar seam should not come loose when you tug on the collar gently. If the stitches pull out or the seam separates, your stitch length was too long or your tension was too loose. Unpick the seam with a seam ripper and re-stitch with a shorter stitch length or tighter tension.