Leggings need a hem that stays flexible, sits flat, and does not turn the ankle into a ridge of bulk. I focus here on the practical side of the job: choosing the right stitch, marking the length cleanly, and finishing the edge so it still moves with the fabric. If you want a tidy, durable result rather than a quick fix that curls after one wash, this is the method I trust.
The shortest route to a stretchy, tidy hem
- Coverstitch gives the cleanest ready-to-wear finish, but a twin needle or narrow zigzag works well on a normal machine.
- Keep the hem shallow. For most leggings, I aim for 1.5-2.5 cm after folding, not a deep trouser-style turn-up.
- Use a stretch or ballpoint needle so the knit is pierced cleanly instead of damaged.
- Do not pull the fabric while sewing. Let the feed dogs move it, or the hem will grow wavy.
- Press lightly and test first on a scrap, especially with polyester-elastane fabrics.
- If the original edge is bonded, decorative, or very bulky, it may be better to leave it alone and shorten elsewhere.
Choose the hem method that suits your machine and fabric
When I hem leggings, I start by matching the method to the fabric and the machine on the table. That matters more than people think. A coverstitch gives the most polished result, but it is not the only good answer. A twin needle is my second choice for home sewing, and a narrow zigzag is often the most forgiving option when the fabric is slippery or the machine is temperamental.
| Method | Best for | Why I use it | Watch out for |
|---|---|---|---|
| Coverstitch | Sports leggings, close-fitting knit trousers, professional-looking finishes | It stays stretchy and looks close to ready-to-wear | Needs a coverstitch machine and careful setup on the round |
| Twin needle | Most leggings on a standard sewing machine | Simple, neat, and widely available | Can tunnel between the rows if the tension or presser foot pressure is off |
| Narrow zigzag or stretch stitch | Everyday leggings, quick alterations, first-time sewists | Flexible, low-risk, and easy to adjust | The finish is more visible and less tailored than a coverstitch |
| Hand slipstitch | Light alterations or delicate knit fabric | Very discreet on the outside | Slow, and not my first choice for activewear that gets a lot of stretch |
| Fusible hem tape | Emergency fixes or low-stretch lounge leggings | Fast and useful when you need a no-sew option | Can feel stiff and may fail on highly elastic fabric |
If I had to narrow it down to one rule, it would be this: the more the leg opening has to stretch in wear, the more I favour a stitch that stretches with it. Once that choice is clear, the next step is getting the length right before any cutting happens.
Mark the new length without stretching the leg out of shape
The easiest way to ruin a legging hem is to mark it while the fabric is being tugged. I like to wash and dry the garment first if it is new, because knits can relax after the first wash. Then I work on a flat surface and keep the leg as smooth as possible. On dark leggings, I use dressmaker’s chalk or a washable pen; on very stretchy fabric, clips are often better than too many pins.
- Try the leggings on with the shoes or trainers they will actually be worn with.
- Mark the finished length on both legs, checking that the side seams line up.
- Add a shallow hem allowance. For most leggings, 1.5-2.5 cm is enough.
- Compare both legs again before trimming. A small imbalance shows up fast on a narrow ankle.
- If the hem is already wide enough, fold it inside rather than cutting aggressively into the leg.
I usually treat a legging hem more like a knit cuff than a trouser hem. The goal is not to build bulk; it is to keep the opening neat. That is why I prefer a shallow fold and a precise line, which leads naturally to the stitch itself.
Sew the hem with enough stretch to survive wear
The stitch matters because leggings are not stable woven trousers. They move, recover, and get pulled on and off constantly. I always start with the right needle first: a stretch needle or ballpoint needle in a size that suits the fabric weight, usually 75/11 or 80/12 for standard jersey, and a slightly heavier option if the knit is thick or brushed. If the needle is wrong, even a good stitch can skip or chew the fabric.
Coverstitch
This is the finish I reach for when I want the most professional result. I press the hem lightly, keep the fold even, and sew with the right side facing up. The key is not to haul the fabric through the machine. On tubular legs, I keep the operation smooth and, if needed, use the differential feed to stop the hem from waving. If the machine starts to drag at a seam intersection, I slow down rather than forcing it.
Twin needle
A twin needle is the best compromise for a normal sewing machine. It gives two rows on the right side and a stretch-friendly zigzag underneath. I usually start with a medium stitch length, around 3 mm, and test on scraps before I commit. If the fabric tunnels between the rows, I reduce the tension slightly or place a small strip of knit stabiliser under the hem while sewing. That extra step is often the difference between a neat result and a rippled one.Read Also: Hem Yoga Pants - Get a Perfect, Wavy-Free Finish!
Narrow zigzag or stretch stitch
This is the most forgiving option if the machine does not love knits. I keep the zigzag narrow, usually around 1.5-2 mm wide, and use a moderate length so the hem still gives when the leg bends. A wide decorative zigzag can work, but on leggings I usually prefer restraint. The finish should support the garment, not announce itself from across the room.
If none of those options is available, a hand slipstitch or fusible knit hem tape can rescue the job, but I treat both as backup methods. They are useful for a quick alteration, not the finish I would choose for leggings that need to handle repeated stretch and washing. With the stitch chosen, the last piece is managing the actual circle of the leg opening cleanly.
Finish the leg opening neatly on the round
Hemming a narrow leg opening is awkward because there is less fabric to feed through the machine and more chance of twisting the edge. I find it helps to work slowly and keep the leg inside out for control. The machine still sews from the right side if that suits the method, but the fabric is easier to manage when the leg is turned to give me space.
- Use the free arm if your machine has one. It makes the leg easier to control.
- Start at the inseam or another low-bulk point so the first stitches are not landing on a thick seam.
- Do not stretch while stitching. Let the fabric feed naturally, or the hem can grow uneven.
- Clip rather than pin if the fabric is highly elastic. Clips distort the fold less.
- Press lightly with a cool or medium iron and a press cloth. Too much heat can shine synthetic fibres.
I also like to leave the thread tails long on a coverstitch or twin needle finish, then secure them neatly on the inside. It is a small detail, but it makes the hem feel finished rather than merely stitched. If the edge still looks odd after all that, the problem is usually one of the common mistakes below, not the leggings themselves.
Avoid the mistakes that show up after the first wash
Most bad legging hems fail for the same few reasons. The good news is that they are easy to recognise once you know what to look for. I keep a short troubleshooting check in my head because it saves me from blaming the fabric when the real issue is the setup.
| Problem | What usually caused it | What I change |
|---|---|---|
| Wavy hem | The fabric was stretched while sewing, or the feed was too aggressive | Stop pulling, reduce pressure, and try differential feed or a stabilising strip |
| Skipped stitches | Wrong needle or a needle that is too blunt for the knit | Switch to a stretch or ballpoint needle and test again on scraps |
| Tunnelling between twin-needle rows | Tension is too tight, or the fabric is too light without support | Loosen the tension slightly or use a light knit stabiliser |
| Hem looks bulky | The fold is too deep for the leg opening | Trim back to a shallow allowance and press the hem thinner |
| Edge curls after washing | The stitch is too stiff for the fabric recovery | Use a more elastic stitch or a better quality stretch thread |
My simplest rule is this: if the hem misbehaves, I look first at the needle, then the stitch, then the way the fabric was handled. I almost never start by blaming the pattern. That saves time and usually points straight to the fix. From there, the only real question is whether leggings should be hemmed at all in every case, and sometimes the answer is no.
When I would leave the original hem alone
There are times when shortening from the ankle is the wrong move. If the leggings have a bonded, laser-cut, or otherwise flat-finished edge, adding a bulky turn-up can make them worse rather than better. The same is true when the style depends on a cuff, zip, or decorative ankle finish that would lose its shape if I cut into it.
- If the hem is already clean and flat, I keep it and alter the length somewhere else if possible.
- If the fabric is very thin and delicate, I choose the least visible stitch or leave the edge untouched.
- If the fit problem is actually at the rise or knee, hemming the ankle will not solve it.
- If the leggings are expensive performance wear, I test on scrap first and keep the alteration minimal.
That is the part people miss: a good hem is not just about sewing a line across the bottom. It is about respecting how the knit behaves, how much stretch the garment needs, and how much bulk the leg opening can tolerate. If I keep those three things in balance, the hem disappears into the design, which is exactly what it should do.
