Taking in shoulders by hand or machine
You can narrow shoulders on a shirt or jacket by taking in the shoulder seams — the seams that run from your neck down to where your arm starts. The most common method is to sew a new, deeper seam parallel to the existing one, then trim away the extra fabric. You can do this by hand with a needle and thread, on a sewing machine, or by watching a video tutorial to see the exact hand movements before you start.
The key is measuring how much narrower you want the shoulders to be, marking that new seam line with tailor's chalk or a fabric pen, and then stitching along that line. Most people reduce shoulder width by half an inch to one inch total — that means taking in a quarter inch to half an inch on each shoulder seam. Taking in more than that can distort the armhole and make the sleeve sit awkwardly.
Key Takeaways
- Shoulder seams run from the base of your neck to the top of your arm, and narrowing them requires sewing a new seam closer to the neckline and trimming the old seam allowance away.
- Measure how much narrower you want the shoulders, then mark that new seam line with tailor's chalk before you stitch to avoid mistakes.
- YouTube videos show the hand-stitching technique step by step, which is useful if you do not have a sewing machine or prefer to work by hand.
- Taking in more than one inch total (half an inch per shoulder) can pull the armhole out of shape and make sleeves sit incorrectly.
- Try on the garment inside-out after marking but before stitching so you can adjust the seam line if it does not feel right.
Measuring and marking the new shoulder seam
Put the garment on inside-out and have someone pin the shoulder seam where it should sit — or stand in front of a mirror and pinch the fabric to see where the new seam line should be. The goal is to have the shoulder seam sit at the edge of your actual shoulder bone, not floating out past it. Mark this pinned line with tailor's chalk or a fabric pen that washes out. Do not rely on memory; mark it while wearing the garment or while it is pinned.
Once you have marked both shoulders, take the garment off and lay it flat on a table. Use a ruler or measuring tape to check that both shoulder seams are the same distance from the neckline — if one is a quarter inch deeper than the other, the garment will hang crooked. Draw a straight line with your chalk or pen along the entire shoulder seam from the neckline to the armpit. This line is where your new stitching will go.
Hand-stitching the new shoulder seam
Thread a needle with thread that matches the garment fabric. Knot the end of the thread. Start at the neckline and use a backstitch — the strongest hand-sewing stitch — to sew along the marked line. A backstitch means you push the needle through the fabric from back to front, then bring it back through the fabric a short distance ahead, creating a solid line of stitches that overlap slightly. Each stitch should be about one-eighth inch long.
Sew slowly and keep your stitches as straight as possible along the marked line. When you reach the armpit area, stop and tie off your thread with a knot on the inside of the garment. Repeat on the other shoulder seam. Once both seams are stitched, try on the garment inside-out to check the fit before you trim away the old seam allowance.
If the fit is correct, trim the old seam allowance down to about one-quarter inch from your new stitching line using sharp fabric scissors. Trim both shoulders. If you have a serger or a sewing machine with a zigzag stitch, you can finish the raw edge to prevent fraying, but this step is optional for a garment you wear regularly.
Using a sewing machine for faster results
If you have access to a sewing machine, the process is faster and the stitches are usually more even. Set your machine to a straight stitch with a stitch length of about 2.5 millimeters. Align the presser foot with your marked line and sew from the neckline to the armpit on one shoulder. Backstitch at the start and end to lock the stitches in place.
Machine stitching is stronger than hand stitching and less likely to come loose with wear. After stitching both shoulders, try on the garment inside-out to confirm the fit. Then trim the old seam allowance to one-quarter inch and finish the raw edge if desired. Most people find machine stitching takes about five to ten minutes per shoulder, compared to twenty to thirty minutes by hand.
Why YouTube videos are useful for this project
Video tutorials show you the hand movements in real time, which is especially helpful if you have never done a backstitch before or are unsure how tight your stitches should be. Watching someone else sew the seam gives you a sense of the pace and pressure needed. Many videos also show the pinning and marking step, which is where most mistakes happen.
Look for videos that show the entire process from trying on the garment to trimming the seam allowance. Videos that focus only on the stitching step skip the measurement part, which is the most important part. Search for "how to take in shoulder seams by hand" or "narrow shoulders on a shirt" to find tutorials that match your skill level.
Common mistakes to avoid
The most common error is taking in too much fabric at once. If you reduce the shoulder width by more than one inch total, the armhole becomes too small and the sleeve will not hang correctly. Start with a smaller adjustment — a quarter inch per shoulder — and you can always take in more later if needed.
Another mistake is stitching without trying on the garment first. Always pin or mark the new seam line while wearing the garment or while it is pinned to fit your body. Measuring on a flat table without trying it on often results in a seam that is too tight or too loose once you wear it.
A third error is stitching unevenly or drifting away from the marked line. If you are hand-stitching, go slowly and use a ruler to check your line every few inches. If you are machine-stitching, use the presser foot as a guide and keep the marked line aligned with the foot edge.
Finishing and trying on the altered garment
After you have stitched and trimmed both shoulders, turn the garment right-side-out and try it on. The shoulders should now sit at the edge of your shoulder bone instead of floating outward. The armhole should feel comfortable and the sleeve should hang straight down from your shoulder.
If the fit is still not right, you can take in the seams a bit more — mark a new line a quarter inch deeper and stitch again. If the shoulders are now too tight, you have gone too far and will need to unpick the stitches and start over. This is why starting with a small adjustment is safer than trying to do it all at once.
Once you are happy with the fit, wash and dry the garment to see how the stitches hold up. Hand-stitched seams are durable if the stitches are tight and even, but they may need reinforcement if you wear the garment frequently. Machine-stitched seams are stronger and require no additional finishing.
Frequently Asked Questions
Can I take in shoulders on a knit fabric or stretchy material?
Yes, but use a ballpoint needle if you are sewing by machine, because ballpoint needles slide between the fibers instead of piercing them and causing runs. For hand-stitching, a regular needle works fine. Knit fabrics are more forgiving than woven fabrics, so you can adjust the seam line more easily if the first fit is not perfect.
What if I only want to narrow one shoulder because one side of my body is smaller?
You can take in one shoulder more than the other, but this is tricky because it can make the garment hang unevenly. Try pinning and trying on the garment with different amounts taken in on each side before you stitch. If the difference is more than a quarter inch, the garment may look crooked even if it feels comfortable.
Do I need special tools to mark the seam line?
Tailor's chalk and fabric pens that wash out are the best options, but you can also use a regular pencil on the inside of the garment if you are careful. Avoid ballpoint pens because the ink may not wash out. Pins work for marking while you are trying on the garment, but you need chalk or pen to mark the line before you stitch.
How long does it take to alter shoulders by hand?
Hand-stitching both shoulders usually takes thirty to forty-five minutes if you are working slowly and carefully. Machine-stitching takes ten to fifteen minutes. The marking and measuring step takes another ten to fifteen minutes. Plan for about an hour total if this is your first time doing the alteration.
What happens if my stitches come loose after I wear the garment?
Hand-stitched seams can come loose if the stitches are too loose or too far apart. If this happens, you can restitch the seam using the same line or unpick the old stitches and sew a new seam slightly deeper. Machine-stitched seams rarely come loose unless the thread breaks, in which case you can restitch over the old line.