The Basic Hem Stitch and Why It Works
A hand-sewn hem uses a stitch called the blind stitch (or ladder stitch), which hides the thread inside the fold of fabric so the stitching is nearly invisible from the outside. The thread runs along the inside of the fold, then dips out to catch a single thread from the garment body, then returns to the fold. This back-and-forth motion creates a seam that holds without puckering and looks neat on both sides.
Hand sewing a hem takes longer than a machine, but it gives you control over tension and lets you work on delicate fabrics or heirloom pieces without risk. Most hems on everyday clothes—trousers, skirts, dresses, and lightweight jackets—can be hand-sewn this way. The stitch works best on woven fabrics like cotton, linen, and wool. Knits and stretchy materials need a different approach, which we'll cover later.
Key Takeaways
- Measure and pin the hem at the correct length before you cut, and press the fold with an iron to make stitching easier.
- Thread a needle with a single strand about 18 inches long, knot one end, and start inside the fold so the knot stays hidden.
- The blind stitch alternates between running the needle along inside the fold and catching a single thread from the garment body below.
- Stitch every quarter-inch along the fold, and finish by running the needle inside the fold for an inch before cutting the thread.
- Press the finished hem with an iron on low heat to set the stitches and remove any puckers.
Measuring and Preparing the Hem
Put on the garment and have someone else measure from the floor (or from where you want the hem to end) up to the fabric. Mark that point with a pin or chalk every few inches around the leg or edge. If you're hemming alone, put on the garment, stand in front of a mirror, and use a ruler or measuring tape to mark the desired length. The hem should be even all the way around—uneven hems are the most visible mistake.
Once you've marked the length, try on the garment one more time to confirm the marks are level. Then lay the garment flat on a table or ironing board. Fold the fabric up along your marked line, pin it in place every 2 to 3 inches, and press the fold with a warm iron. The crease makes the fold visible and easier to stitch along. Let the fabric cool before you remove the pins.
Measure how much fabric you have below the fold. Most hems need 1 to 1.5 inches of fabric turned up. If you have more than 2 inches, trim the raw edge to 1.5 inches with scissors, then fold that trimmed edge up another half-inch and press it again. This double fold (called a double-fold hem) keeps the raw edge from fraying and looks professional. For lightweight fabrics, a single fold is fine.
Threading the Needle and Starting the Stitch
Cut a length of thread about 18 inches long—longer than that and it tangles; shorter and you'll run out mid-seam. Use thread that matches the garment color as closely as possible. A single strand is standard; do not double the thread. Thread the needle, then tie a small knot at one end of the thread.
Start at a seam or inconspicuous spot (the inside of a trouser leg, for example). Push the needle through the fold of the hem from inside, so the knot stays hidden in the fold. Bring the needle out about a quarter-inch along the fold. You're now ready to begin the blind stitch.
The Blind Stitch: Running the Seam
The blind stitch has a rhythm: needle in the fold, needle out to catch fabric, repeat. Here's the exact sequence:
- With the needle pointing along the fold (parallel to the edge), run it inside the fold for about a quarter-inch. The needle stays inside the fold the whole time—you don't see it from outside.
- Bring the needle out of the fold and push it straight across (perpendicular to the fold) into the garment body just below the fold. Catch only one or two threads from the garment—not all the way through to the back.
- Push the needle back into the fold, directly across from where it came out, and run it along inside the fold for another quarter-inch.
- Repeat: out of the fold, across into the garment, back into the fold, along the fold.
Keep your stitches small and even. Pulling too tight will pucker the fabric; too loose and the hem won't hold. The thread should be snug but not straining. As you work, the fold will naturally hide the thread, and from the outside you'll see only tiny dots where the needle caught the garment.
Finishing the Hem and Pressing
When you reach the end of the hem (or when your thread is about 3 inches from the needle), run the needle inside the fold for about an inch without catching the garment. This anchors the thread. Then push the needle out, pull the thread snug, and cut it close to the fabric. The thread will slip back inside the fold and disappear.
Try on the garment and check that the hem hangs evenly and feels find. If you see any gaps or loose spots, go back and add a few more stitches. Once you're satisfied, lay the garment flat and press the hem with a warm iron on low heat. Press from the inside first, then from the outside. This sets the stitches and removes any puckers from handling.
Hemming Knits and Stretchy Fabrics
Knit fabrics and stretchy materials like jersey or lycra need a different stitch because the blind stitch can break when the fabric stretches. Instead, use a ballpoint needle (which slides between fibers rather than piercing them) and the stretch blind stitch. This stitch is identical to the regular blind stitch except you take slightly longer runs inside the fold—about half an inch instead of a quarter-inch—which gives the thread room to move when the fabric stretches.
Alternatively, if the knit is very stretchy or if you're hemming a swimsuit or athletic wear, consider using a twin needle on a sewing machine instead. A twin needle creates two parallel rows of stitching that flex with the fabric. If you don't have a machine, a stretch blind stitch by hand will work, but take your time and don't pull the thread tight.
Common Mistakes and How to Avoid Them
The most common error is catching too much fabric when you stitch across into the garment body. If you catch all the way through to the back, the stitches will show on the outside. Catch only the surface threads—imagine you're barely grazing the fabric. A second mistake is pulling the thread too tight, which puckers the fold. Keep tension even and gentle.
Uneven hems happen when you don't measure carefully at the start. Take time to mark the length all the way around before you fold and pin. If you discover the hem is uneven after stitching, you can unpick the stitches (use a seam ripper or small scissors to cut the thread every few stitches, then pull), re-measure, and stitch again. It's tedious but fixable.
Fraying at the raw edge is a sign you need to fold the edge up again or use a whip stitch to seal it. If the hem is already finished and the edge is fraying, a small dab of clear fabric glue on the raw edge will stop it without stiffening the fabric.
Frequently Asked Questions
Can I hand sew a hem on jeans or heavy denim?
Yes, but use heavy-duty thread and a needle designed for thick fabric. Denim is stiff, so the blind stitch will be visible—that's normal and acceptable on jeans. You may need to use a thimble to push the needle through without hurting your finger. Work slowly and take smaller stitches than you would on lighter fabric.
What if I don't have matching thread?
Use thread one shade darker than the fabric if you can't find an exact match. Darker thread is less visible than lighter thread because it blends into shadows in the fold. If the garment is a print or pattern, choose a thread color that matches the dominant color.
How do I fix a hem that came loose?
If only a section came undone, you can re-stitch just that part. If the whole hem is loose, unpick the old stitches and re-sew using the same method. If the thread is old and brittle, remove all of it and start fresh with new thread. Old thread breaks easily and won't hold.
Is hand sewing a hem permanent?
A hand-sewn hem lasts as long as the thread holds and the fabric doesn't wear through. With normal wear, a well-stitched hem on a quality garment can last years. Hems on frequently washed items (like everyday trousers) may need re-stitching after several years as the thread weakens. This is normal and straightforward to repair.
Can I use a thimble to protect my finger?
Yes. A thimble protects the finger you use to push the needle through, especially on thick fabrics. Wear it on your middle finger or whichever finger you use to guide the needle. Some people find thimbles awkward at first, but they prevent soreness on long projects.