Have you ever looked at a professionally made swimsuit or a cute tank top and wondered how they get those clean, stretchy edges? The secret is often a wonderful little supply called fold-over elastic. If you’ve ever felt a bit nervous about trying it, you’re in the right place.
Learning how to sew fold over elastic is a game-changer. It can take your homemade clothes from looking “nice” to looking store-bought. But it can also seem tricky. How do you get it to lie flat? How do you keep the fabric from slipping?
Don’t worry. Today, I’m going to walk you through four simple, no-fuss methods for sewing with fold-over elastic, or “FOE” as many sewers call it. You’ll be adding a perfect finish to all your stretchy projects in no time.
First, What Is Fold-Over Elastic?
Before we start sewing, let’s get to know our main tool. Fold-over elastic is a special kind of elastic designed to be a finished edge. It’s perfect for things like necklines, armholes, lingerie, and swimwear—anywhere you need a clean, stretchy edge on a knit fabric.
If you look closely at a piece of FOE, you’ll notice a few things.
- A Center Line: There is a faint line running right down the middle. This is a built-in guide to help you fold it perfectly in half.
- A Shiny Side and a Matte Side: One side is usually a little shinier than the other. The shiny side is the “right side” or the outside of your project. The duller, more matte side is the “wrong side” that goes against the fabric.
Its job is to wrap around, or “sandwich,” the raw edge of your fabric, giving it a beautiful and durable finish that moves with you.
Getting Your Machine Ready for Success
A little prep work makes all the difference. Before you start sewing, let’s make sure your machine is set up for stretchy fabrics.
Choose a needle made for knits, like a ballpoint or stretch needle. These needles have a rounded tip that slides between the fabric threads instead of piercing them, which prevents holes and snags. For thread, a good quality all-purpose polyester thread is a great choice because it has a little bit of stretch itself.
Unless a method below says otherwise, you won’t need to stretch the elastic as you sew. Just let it feed through the machine naturally.
4 Simple Ways to Sew Fold Over Elastic
Now for the fun part! Here are four different techniques, from the most classic approach to one that gives a super-professional look.
Method 1: The Classic Zigzag Sandwich
This is the most common and straightforward way to attach FOE. You simply sandwich your fabric inside the folded elastic and use a zigzag stitch to secure it all in one go.
First, take your fabric and place its raw edge right along the center line on the wrong side of the elastic. Then, fold the top half of the elastic over the fabric, creating a neat little sandwich.
Set your sewing machine to a zigzag stitch. You’ll want the stitch to be wide enough to catch both edges of the elastic but not so wide that it goes off the edge. A medium stitch length (around 2.5-3.0 mm) is perfect. Now, just sew everything together, keeping the fabric tucked inside. The result is a clean, stretchy finish that looks great on both sides.
Method 2: The Secure Overlock Stitch
Sometimes, certain fabrics don’t play nicely with a standard zigzag stitch. If you find your fabric is bunching up or the zigzag doesn’t look quite right, try using an overlock stitch on your sewing machine. This is not the same as a serger machine; it’s a special stitch setting found on many modern sewing machines that mimics an overlock.
The process is exactly the same as the zigzag method. You sandwich the fabric inside the elastic and sew it down. An overlock stitch can sometimes create a flatter, smoother finish than a zigzag, so it’s a great alternative to have in your toolbox.
Method 3: The Two-Step Stitch for Perfect Control
Are you having trouble keeping the fabric from wiggling out of the elastic as you sew? This two-step method is your new best friend. It’s perfect for beginners or anyone working with very slippery fabric.
First, lay your elastic flat with the wrong side facing up. Place your fabric’s raw edge on one half of the elastic, with the fabric’s wrong side also facing up. Now, sew just that one side of the elastic to the fabric using a zigzag stitch.
Next, fold the other half of the elastic over to the front and stitch it down along the edge. Because the first line of stitches is already holding everything in place, it’s so much easier to get a perfectly straight and secure finish. From the front, it looks just like the classic method, but it gives you total control.
Method 4: The Professional Twin Needle Finish
If you want a truly professional finish that looks like it was made on a special coverstitch machine, the twin needle is the way to go. A twin needle is a single needle that fits into your machine but has two needles at the bottom. This allows you to sew two perfectly parallel rows of straight stitches at the same time.
To use this method, you will need two spools of thread for the top and one bobbin as usual. Sandwich your fabric inside the elastic just like in the first method. Then, sew down the middle with the twin needle. You’ll want to choose a twin needle with a width that allows one needle to sew near the top edge of the elastic and the other to sew near the bottom edge.
The result is beautiful. On the top, you have two neat rows of straight stitches. On the back, the bobbin thread creates a zigzag pattern that allows the seam to stretch. It’s a fantastic way to finish swimwear and activewear.
Which Fold-Over Elastic Method Should You Use?
Here is a quick table to help you decide which technique is right for your project.
| Method Name | Best For | Final Look | Difficulty |
|---|---|---|---|
| Classic Zigzag | All-purpose use, quick projects | Classic, clean zigzag on both sides | Easy |
| Overlock Stitch | When zigzag isn’t working, a flatter finish | A flatter, more subtle stitched edge | Easy |
| Two-Step Stitch | Beginners, slippery fabrics, ultimate control | Clean single stitch on front, two on back | Easy |
| Twin Needle | A professional, “store-bought” appearance | Two parallel straight stitches on top | Intermediate |
FAQs
How to sew elastic properly?
You should use a special needle. A stretch or ballpoint needle works best. These needles do not damage the fabric. Always use a stitch that can stretch. Let your sewing machine do the work. Do not push or pull the fabric.
What is the best stitch for sewing elastic?
A zigzag stitch is the best choice for elastic. It is strong. It also stretches very well. Many machines also have a special stretch stitch. A three-step zigzag is another great option for a very strong seam.
Can I iron fold over elastic?
Yes, you can iron it. But you must be careful. Use a very low heat setting. High heat can melt the elastic. Place a cloth between the iron and the elastic. This protects it from the direct heat.
How to sew elastic under tension?
Sometimes you need to stretch elastic as you sew. Hold the elastic in front of and behind the presser foot. Gently pull it to the length you need. Guide the fabric straight. Let the machine feed the fabric through.
How to join elastic ends?
To make a loop, you can join the ends. Overlap the two ends slightly. Use a wide zigzag stitch. Sew back and forth a few times. This will make the join very strong and secure.
You’re Ready to Master Fold-Over Elastic
See? Learning how to sew fold-over elastic isn’t scary at all. It just takes a little practice and knowing you have options. Whether you choose the quick and easy zigzag or the professional twin needle, you now have the skills to give your stretchy garments a beautiful and durable finish.
The next time you are making leggings, a swimsuit, or a simple knit top, grab some fold-over elastic and give one of these methods a try. You’ll love the results.
What project will you try first with your new FOE skills? Let us know in the comments below. Happy sewing