The fastest repair depends on where the hole is and how big it is
A small hole in a knit sweater can be closed in three ways: by darning (weaving yarn across the gap), by using a needle to pull surrounding stitches together, or by patching from the inside. Darning works best for holes smaller than a quarter-inch and in the body of the sweater where the repair will be less visible. The needle-pull method, called ladder stitch, works when the hole is between two columns of stitches and you can still see the vertical "ladders" of yarn running through the knit. Patching is your best option for larger holes or damage near seams and edges, where the knit structure is already compromised.
The method you choose also depends on whether you have yarn that matches the sweater. If you do not, a patch can be made from contrasting yarn and become a deliberate design feature rather than a hidden repair. If the hole is in a high-wear area like an elbow or cuff, patching will also last longer than darning, because the patch reinforces the weakened fabric underneath.
Key Takeaways
- Darning works for small holes (under a quarter-inch) in the flat body of a sweater and requires matching yarn and a darning needle.
- Ladder stitch closes holes between two columns of stitches by pulling the loose strands back into alignment without adding new yarn.
- Patches are the strongest repair for large holes, worn areas, or damage near seams, and can be made from matching or contrasting yarn.
- All three methods require the sweater to be clean and dry, and the area around the hole to be examined for loose stitches that need securing first.
How to darn a small hole with matching yarn
Start by threading a darning needle (a blunt needle with a large eye) with yarn that matches the sweater as closely as possible. Tie a small knot at the end. From the inside of the sweater, push the needle up through the fabric about a quarter-inch to one side of the hole, then bring it back down a quarter-inch on the other side. You are creating a line of stitches that runs horizontally across the hole, parallel to the rows of the sweater's knit.
Work your way down the hole, creating horizontal lines of yarn about a quarter-inch apart. Once you have covered the hole with horizontal lines, repeat the process in the opposite direction, weaving the needle over and under the horizontal lines you just created. This creates a woven grid that fills the hole. The key is to keep the tension loose enough that the repair does not pucker the surrounding fabric, but tight enough that the yarn does not slip through.
When you reach the bottom of the hole, tie off the yarn on the inside of the sweater with a small knot, then weave the needle through a few stitches nearby before cutting the yarn. This anchors the knot so it does not come loose in the wash.
Using ladder stitch to close holes between columns of stitches
Ladder stitch works only when the hole is a vertical split between two columns of stitches and you can still see the horizontal strands (called ladders) that run between them. This often happens when a seam has split or when a snag has pulled the stitches apart without breaking the yarn itself.
Thread a darning needle with yarn that matches the sweater. From the inside of the sweater, insert the needle under the lowest horizontal ladder on one side of the split. Pull the yarn through, then insert the needle under the corresponding ladder on the opposite side. Continue working your way up the split, alternating sides and pulling each ladder back into place. As you pull, the stitches on either side of the split will tighten and close the gap.
Once you reach the top of the split, tie off the yarn on the inside with a small knot, then weave the needle through several nearby stitches before cutting. This repair is nearly invisible from the outside because you are not adding new yarn—you are straightforward realigning the yarn that was already there.
Patching a large or worn hole
For holes larger than a quarter-inch, or for damage in high-wear areas like elbows, a patch is stronger and more durable than darning. You can make a patch from a scrap of knit fabric (even from an old sweater) or from a piece of knit interfacing, which is a stabilizing fabric sold in fabric stores.
Cut a patch that is at least a half-inch larger than the hole on all sides. If you are using knit fabric, cut it so the grain runs the same direction as the sweater. Pin the patch to the inside of the sweater, centered over the hole. Using a needle and thread that matches the sweater (not the patch), sew around the edge of the patch with a small running stitch, about a quarter-inch from the edge. Sew slowly and keep your stitches small and even.
Once the patch is sewn down, you can leave it as is on the inside, or you can trim away the damaged fabric from the outside and sew a decorative patch over the hole from the front. A contrasting patch can become a design feature—many people deliberately patch sweaters with colorful fabric or embroidery as a style choice.
Preparing the hole before you repair it
Before you start any repair, examine the area around the hole for loose or unraveling stitches. If the edges of the hole are frayed or coming apart, use a needle to pull any loose strands back into the surrounding stitches and find them with a small knot on the inside. This prevents the hole from getting larger during washing or wearing.
Wash and dry the sweater before you repair it. A clean sweater is easier to work with, and you will be able to see the damage clearly. Let the sweater dry completely—wet yarn is harder to thread and harder to control while you are sewing.
If the hole is in a seam or very close to an edge, consider taking the sweater to a professional tailor or knit repair specialist. These areas are structurally important, and a repair done incorrectly can cause the seam to fail or the edge to unravel further.
Choosing yarn and needle size for your repair
The yarn you use should match the weight (thickness) of the sweater's yarn as closely as possible. If you do not have the original yarn, unravel a small section of the sweater from an inconspicuous area (like inside a seam) to see what you are working with. Take a photo of the label if it is still attached, or bring the sweater to a yarn store and ask for help matching the weight and fiber content.
A darning needle is different from a regular sewing needle—it has a blunt tip and a large eye that will not split the yarn as you work. Darning needles come in different sizes; choose one that the yarn passes through easily without being too loose. If you cannot find a darning needle, a tapestry needle (also blunt, used for needlepoint) will work in a pinch.
When to take the sweater to a professional
Some damage is beyond a home repair. If the hole is very large (bigger than an inch across), if it is in a seam or at an edge, if the yarn is delicate or unusual (like mohair or silk), or if the sweater is expensive or sentimental, a professional knit repair specialist can do a better job than you can at home. They have access to specialized equipment and can often source yarn that matches exactly.
Professional repairs cost between $30 and $100 depending on the size and location of the damage, and they usually take two to four weeks. If the sweater is valuable to you, this is money well spent. You can find knit repair specialists through local yarn stores, dry cleaners that handle specialty fabrics, or by searching online for "sweater repair" or "knit repair" in your area.
Frequently Asked Questions
Can I repair a hole in a sweater that has already been washed?
Yes. In fact, washing the sweater before you repair it is a good idea because it removes dirt and makes the damage easier to see. Make sure the sweater is completely dry before you start the repair, because wet yarn is difficult to work with and will not hold stitches as well.
What if I do not have matching yarn?
You have two options: use a contrasting yarn and make the patch a visible design feature, or unravel a small section of the sweater from an inconspicuous area (like inside a seam) to get matching yarn. If the sweater is knit from a common yarn weight and fiber, a yarn store can often help you find a close match.
Will a darned hole hold up in the washing machine?
A darned repair will hold if it is done carefully and the tension is even, but it is not as strong as the original fabric. Wash the sweater in cold water on a gentle cycle and lay it flat to dry. Avoid the dryer, which can weaken the repair. For high-wear areas, a patch is more durable than darning.
How do I know if a hole is too big to repair at home?
If the hole is larger than an inch across, or if it is in a seam, at an edge, or in a delicate or unusual yarn, a professional repair is worth considering. Holes in these locations are structurally difficult to repair and a mistake can make the damage worse.
Can I use regular thread instead of yarn to darn a sweater?
No. Regular thread is too thin and will not blend with the sweater's texture. It will also break easily under the stress of wearing and washing. Always use yarn that matches the weight of the sweater's yarn.