How to Shorten Jacket Sleeves

Measuring the Sleeves

Try on the jacket to determine the new sleeve length. To get the best possible fit, put the jacket on and identify where you would like the sleeves to fall. It is a good idea to bend your arms and hold them straight at your sides to see where you are most comfortable with the sleeves ending in these positions. You may want to choose a midpoint measurement between these 2 spots. For example, if you want the sleeves to end right at your wrist, but they are too short at this length when you bend your elbows, then you might need to shorten them so that they end about 0.5 cm (0.20 in) below your wrists instead.

Mark the sleeves where you want them to end. Mark the position in a few spots around the sleeve with a piece of chalk. Then, remove the jacket and connect the marks into a solid line going around the sleeve. You may want to use a ruler to help you get a straight line and to ensure that all of the marks are the same distance from the end of the sleeve.

Measure 2 in (5.1 cm) from the marks you made. The spot you identified is not where you will need to cut your jacket sleeves. You will need to leave room for the seam allowance, so measure 2 in (5.1 cm) from the first line going towards the end of the sleeve. Mark this spot in a few places around the sleeve using a piece of chalk. Then, connect the marks in 1 solid line. This will leave a little extra room in case you need to lengthen the sleeves again in the future.

Cutting the Sleeves

Use a seam ripper to pull out the stitches along the hem and seam. Rip the stitches by running the hook section of the seam ripper through the stitches on the hem and seam of the jacket. You will need to remove the stitches before you start cutting. This will detach the sleeve lining from the sleeve fabric, which is necessary for hemming the sleeve properly. Be careful not to rip the fabric as you do this! If the shirt has mitered corners around the buttons, you'll need to open that up, as well.

Slide the lining fabric up and out of the way. To avoid cutting through the lining fabric, move it up into the sleeve so it will be out of your way. Cutting the lining along with the jacket's exterior fabric may affect the fit of your jacket. You may want to pin the lining up inside of the sleeve to ensure that it will not get in the way when you cut the outer fabric. It's a good idea to press the pieces of the sleeves to ensure you have nice clean edges to work with.

Cut the outer fabric along the second line you created. Cut straight along the line all the way around the sleeve using a pair of sharp scissors. Make sure to cut the outer sleeve fabric only. Repeat the same process for both sleeves.

Hemming the Sleeves

Pull the lining fabric back down. Pull down the lining so that it extends past the new end of the sleeve fabric. If you used pins to hold the fabric back, then take out the pins first.

Cut the lining just a little longer than the finished sleeve. Trim the jacket lining so it's just a little longer than the finished sleeve will be. This will be just a little shorter you cut the sleeve fabric to, since it was cut to account for the seam allowance. If you cut the lining to the exact same length as the finished sleeve, it will pull and make the sleeve look puckered.

Fold the fabric under by 5 centimetres (2.0 in) so it covers the lining. Ensure that the jacket lining and outer material are lined up. Then, fold the outer material at the end of the sleeve over the lining fabric towards the inside of the sleeve. This will hide the raw edges of the lining and outer material.

Place a few pins around the folded sleeve to keep it in place. Insert the pins going perpendicular to the end of the sleeve so they will be easier to remove as you sew. Place a pin about every 5 cm (2.0 in).

Secure the folded fabric with a straight stitch. Set your sewing machine to the straight stitch setting and sew all the way around the edges of the sleeve. Make sure to use a thread that matches the color of the jacket, such as black thread for a black jacket. Position the stitch about 3 cm (1.2 in) from the folded edge. Remove the pins before you sew over each area to avoid damaging your machine. You can also sew the sleeve by hand, if you prefer.

Backstitch by 5 cm (2.0 in) when you reach the end. To secure the final stitches, press down on the lever on the side of your sewing machine and hold it while still applying gentle pressure to the pedal. This will reverse the direction of your sewing machine. Sew for 5 cm (2.0 in) and then release the lever and sew back to where you started. Trim off the excess threads and you are done with the sleeve! After you finish sewing the first sleeve, repeat the process for the second sleeve.