Where to Take In a Jacket and How Much You Can Remove

A jacket can be made smaller by taking in the side seams, shoulder seams, and sleeve seams—the three places where fabric can be safely removed without destroying the garment's structure. Most jackets can be reduced by 1 to 2 inches total (split between both sides), which means taking in roughly half an inch to an inch from each side seam. Going larger than that risks throwing off the jacket's proportions and making armholes too tight.

Start by trying on the jacket inside-out and pinching the fabric at the side seams to see how much excess you have. Ask someone to help you mark where the new seam should run using tailor's chalk or a fabric pen—mark both the front and back, and make sure the line is parallel to the original seam. Take a photo of the marked jacket so you have a reference while you work.

Shoulder seams are trickier and usually require more experience, so save those for a second project if this is your first time. Sleeve seams are straightforward but affect how the sleeve hangs, so measure carefully before cutting anything.

Key Takeaways

  • The side seams are the safest place to remove fabric, and you can typically take in up to 1 inch per side without affecting the jacket's fit.
  • Mark the new seam line while wearing the jacket inside-out, with help from another person, before you cut or sew anything.
  • Sew the new seam using a straight stitch, then try the jacket on before trimming the old seam allowance away.
  • Trim the excess fabric to about half an inch from your new seam, and finish the raw edges with a zigzag stitch or pinking shears to prevent fraying.
  • Pressing your seams flat with an iron after sewing makes the jacket look professionally finished and helps the fabric settle into its new shape.

Preparing Your Workspace and Gathering Tools

You will need a sewing machine, thread that matches the jacket, scissors or a seam ripper, tailor's chalk or a fabric pen, pins, an iron, and a measuring tape. If the jacket has a lining, you will also need to work with that separately—more on that below. Set up your sewing machine with a fresh needle and thread the bobbin and top thread according to your machine's manual.

Press the jacket with an iron before you begin so the fabric is flat and you can see the original seams clearly. Wrinkled fabric will shift as you mark and sew, throwing off your measurements. Work on a large, clean surface where you can lay the jacket flat or drape it over a dress form if you have one.

Marking and Pinning the New Seam Line

Put the jacket on inside-out and have someone stand behind you with tailor's chalk or a fabric pen. Pinch the fabric at the side seam until the jacket fits the way you want it, then have them mark a line parallel to the original seam. Do this on both the front and back of the jacket, and mark both the left and right sides. The line should be straight and even—use a ruler or measuring tape to double-check the distance from the original seam.

Take the jacket off and lay it flat. Use a measuring tape to confirm the marked line is the same distance from the original seam all the way down—check at the armpit, the waist, and the hem. Uneven marks will create a twisted seam that pulls the jacket out of shape. Once you are confident the marks are correct, use pins to hold the fabric in place along the marked line, pinning perpendicular to the seam so the pins do not shift as you sew.

Sewing the New Seam

Sew slowly along the marked line using a straight stitch and a stitch length of 2.0 to 2.5 millimeters. Start at the top of the jacket and sew toward the hem, removing pins as you go. Backstitch at the beginning and end to lock the thread. Sew both the left and right side seams, then try the jacket on to check the fit before you trim anything.

If the jacket is too tight or too loose, you can adjust. If it is too tight, you can pick out the stitches with a seam ripper and re-sew a quarter-inch farther from the edge. If it is too loose, the jacket is not salvageable at that seam—you would need to take it in more, which risks making it unwearable. This is why trying on before trimming is essential.

Dealing with the Lining

Most jackets have a lining sewn to the inside of the outer fabric. You will need to open the lining at the side seams, take it in by the same amount you took in the outer fabric, and then sew it closed again. Use a seam ripper to carefully cut the stitches holding the lining to the outer seam, working a few inches at a time so you do not accidentally cut the lining itself.

Once the lining is loose, mark and sew the new seam on the lining using the same method as the outer fabric. The lining seam should be slightly inside the outer seam so it does not show when you wear the jacket. After sewing, fold the lining back into place and hand-stitch it closed using a ladder stitch or whip stitch, which are nearly invisible from the outside.

Trimming and Finishing the Seam Allowance

After you have confirmed the fit and sewn the lining, trim the old seam allowance down to about half an inch from your new seam. Use sharp scissors and cut slowly so you do not accidentally cut through your new stitches. Trim both the outer fabric and the lining.

Finish the raw edges with a zigzag stitch on your sewing machine to prevent fraying, or use pinking shears (scissors with a zigzag blade) to cut the edges. If the fabric is prone to fraying, you can also explore a thin line of seam sealant like Fray Check along the cut edge, though this is optional for most jacket fabrics. Press the seam flat with an iron, pressing from the inside of the jacket so you do not create shine marks on the outer fabric.

Taking In Sleeves

Sleeve seams run from the armpit to the cuff. To take in a sleeve, try on the jacket and have someone pinch the fabric along the underside of the sleeve until it fits properly. Mark the new seam line with tailor's chalk, then sew and trim the same way you did the side seams. Sleeves are narrower than side seams, so even a quarter-inch reduction per side can make a noticeable difference.

Be aware that taking in the sleeve seam changes how the sleeve hangs and rotates on your arm. If the sleeve was already tight in the upper arm, taking it in at the seam will make it tighter. Test the fit carefully before trimming, and consider whether you need to take in the armhole as well—that is a more advanced alteration and usually requires a tailor's experience.

Common Mistakes to Avoid

The most common mistake is taking in too much fabric at once. A jacket that is 2 inches too large on each side needs only half an inch removed per side, not a full inch. Removing too much throws off the proportions and makes the armholes uncomfortably tight. Mark conservatively and sew a test seam before you commit.

Another mistake is sewing the new seam without trying the jacket on first. Fabric shifts as you handle it, and your marks may not be perfectly accurate. Sewing, trying on, and adjusting takes longer but saves you from ripping out stitches and starting over. A third mistake is forgetting to adjust the lining—if you take in the outer seam but leave the lining loose, the lining will bunch up inside the jacket and look sloppy.

Finally, do not trim the seam allowance until you have confirmed the fit. Keep the old seam intact as a safety net in case you need to let the jacket back out. Once you trim it away, you cannot easily undo the alteration.

Frequently Asked Questions

Can I take in a jacket at the shoulders?

Yes, but it is difficult and usually requires experience. Shoulder seams affect how the entire jacket hangs, and moving them even a quarter-inch can throw off the sleeve position and armhole shape. If the shoulders are too wide, a tailor is the safer choice for a first project.

What if my jacket has buttons or pockets in the side seams?

You cannot take in a seam that has a pocket or button attached to it without moving the pocket or button. Pockets can be repositioned, but that is an advanced alteration. If the pocket is in the way, consider taking in the sleeve seams instead, or have a tailor handle the project.

How much can I take in before the jacket is ruined?

Most jackets can be reduced by 2 inches total (1 inch per side) before the proportions start to look wrong. Beyond that, the armholes become too small, the sleeves sit too far forward, and the jacket loses its shape. If your jacket is more than 2 inches too large, a tailor may recommend a different alteration or suggest the jacket is not a good candidate for taking in.

Do I need to wash the jacket before I sew?

Check the care label. If the jacket is dry-clean only, do not wash it. If it is machine-washable, washing before you sew prevents shrinkage after the alteration. Let the jacket dry completely and press it flat before you mark the new seams.

What thread color should I use?

Match the thread to the jacket fabric, not the original thread. Hold several thread colors up to the jacket in natural light and pick the closest match. If the jacket is a blend of colors, choose the dominant color. Thread that matches the fabric will be nearly invisible from the outside, even if the original seam was sewn with a different color.