DIY Long Cardigan Sewing Pattern: Women’s Open Front Cardigan Tutorial for Easy Knit Fabric

If you’ve been searching for the perfect cozy layering piece and want to make it yourself, you’ve landed in exactly the right place. This DIY long cardigan sewing pattern walks you through everything you need to know to create a beautiful, drapey, open front cardigan from knit fabric. Whether you’re a beginner who has sewn a few simple projects or an intermediate sewist looking for a quick weekend make, this tutorial is designed to be approachable, clear, and genuinely useful from the cutting table to the finished hanger.

A long open front cardigan is one of those wardrobe staples that earns its place the moment you finish it. You can throw it over jeans and a tee, layer it over a dress, or wrap it around yourself on a chilly morning with a cup of coffee. Because it’s made from knit fabric, there’s no button band to wrestle with, no buttonholes to stress over, and no lining required. The fabric does all the beautiful work of draping and softening every outfit you pair it with.

Let’s dive in.

What You’ll Need Before You Start

Before you cut a single piece of fabric, gathering your materials and understanding your tools will save you so much time and frustration. Here’s a complete list of what you’ll need for this project.

Fabric: Choose a medium-weight knit fabric with good drape. Jersey knit, rayon jersey, bamboo jersey, sweater knit, and ponte are all wonderful choices depending on the look you want. For a flowy, lightweight cardigan, rayon jersey is hard to beat. For something with more structure that keeps its shape beautifully, ponte is your friend. Avoid fabrics with very little stretch or very heavy weight for your first attempt. You’ll need approximately 2.5 to 3 yards for a size small to medium, and 3 to 3.5 yards for a large to extra-large.

Thread: Use a stretch thread or a high-quality all-purpose polyester thread. Polyester thread has enough give for knit seams. Avoid cotton thread for this project because it can break under the stress of a knit seam stretching.

Sewing Machine Needles: Use a ballpoint or stretch needle, size 75/11 or 90/14 depending on your fabric weight. These needles are designed to push between knit loops rather than pierce them, which prevents skipped stitches and holes in your fabric.

Sewing Machine Stitches: A serger is ideal for knit fabrics, but you absolutely do not need one. A regular sewing machine works perfectly when you use a narrow zigzag stitch (about 1.0 to 1.5 width and 2.5 length) or the stretch stitch if your machine has one. Both mimic the give of a serged seam.

Pins or Wonder Clips: Either works on knit fabric, though many sewists prefer clips because they don’t distort stretchy fabric the way pins sometimes can.

Rotary Cutter, Mat, and Ruler: These make cutting knit fabric so much easier and more accurate than scissors alone. Knit fabric can shift and stretch under scissors, so a rotary cutter gives you clean, precise edges.

Tailor’s Chalk or Fabric Marker: For marking your fabric.

Iron and Pressing Cloth: Even knit fabrics benefit from careful pressing. Use a damp pressing cloth and hover your iron rather than pressing down hard to avoid stretching your pieces.

Understanding Your Measurements

This pattern is drafted to be cut based on your own body measurements rather than standard sizing labels, which means it will actually fit you rather than the mythical “standard” body that pattern sizes are based on.

Take the following measurements and write them down:

Your bust measurement is taken around the fullest part of your chest, keeping the tape measure parallel to the floor. Your hip measurement is taken around the fullest part of your hips. Your back length is measured from the prominent bone at the base of your neck down to where you want the back hem to fall. For a long cardigan, this is typically around 32 to 36 inches, depending on your height and preference. Your shoulder width is measured from the edge of one shoulder across the back to the other shoulder edge. Your sleeve length is measured from the top of your shoulder down to your wrist bone.

Keep in mind that because this is an open front, relaxed fit cardigan, we’re going to add ease to the bust measurement. For a comfortable, relaxed fit, add 4 to 6 inches of ease to your bust measurement. If your bust is 38 inches, you’ll be working with a finished cardigan front width of approximately 42 to 44 inches total across both front panels and the back.

Drafting the Pattern Pieces

This cardigan is made up of just a handful of pieces, which is part of what makes it such a satisfying project. You’ll have a back piece, two front panels, two sleeves, and an optional band piece for the front opening and hem.

Back Panel: Draw a rectangle that is half your adjusted bust measurement wide (so if your total adjusted bust is 42 inches, the back panel is 21 inches wide) and your desired back length tall. At the shoulder, taper the sides in by about half an inch on each side to create a gentle shoulder slope. Add a half-inch seam allowance around all edges.

Front Panels: Each front panel is drawn as a rectangle that is roughly one quarter of your adjusted bust measurement wide, so about 10.5 inches for the same example. The length matches your back panel. These two pieces, when joined at the shoulders and sides, create the open front. Add a half-inch seam allowance to the shoulder, side, and hem edges. The front opening edge (the center front) does not need a seam allowance if you’re finishing it with a band, but add 1 inch there if you plan to simply hem it.

Sleeves: Draft a simple rectangle that is your sleeve length tall. The width at the top should equal your shoulder to shoulder measurement plus about 2 inches for ease, and the width at the bottom (the cuff area) can taper slightly or remain the same depending on whether you prefer a tapered or boxy sleeve. For a relaxed sleeve, keeping the width consistent creates a beautiful, simple shape. Add a half-inch seam allowance around the whole sleeve piece.

Front Band (Optional but Recommended): Cut two long strips that are each 3 inches wide and as long as the full front opening edge of your cardigan — which means you measure from the hem at the bottom front, up along the front opening, across the back neck, and back down the other front opening. This creates a continuous band that finishes the front edges and back neckline in one elegant piece.

Cutting Your Fabric

Fold your fabric in half lengthwise, right sides together, and make sure the fold is on grain. Knit fabric has a lengthwise grain running parallel to the selvage and a crosswise grain running perpendicular. Place your pattern pieces so the greatest stretch runs around the body (crosswise), not up and down. This is important because it ensures the finished cardigan has give where you need it.

Cut your back panel with the center back placed on the fold so you don’t have a seam down the back. Cut your two front panels, two sleeves, and your band strips.

Lay pieces flat after cutting and let them relax for about 15 to 20 minutes before sewing. Knit fabric cut on the bias or cut when under tension can retract slightly once relaxed, so this resting period helps you avoid puckered seams later.

Sewing the Cardigan Together

Now we get to the fun part. Work in the following order for the smoothest construction process.

Step One: Sew the Shoulder Seams

Place one front panel and the back panel right sides together, lining up the shoulder edges. Sew the shoulder seam with your stretch stitch or narrow zigzag, using a half-inch seam allowance. Repeat for the other shoulder. Press these seams gently toward the back.

Step Two: Attach the Sleeves

Open the cardigan body flat at the shoulders. Find the center of each sleeve top (mark it with a clip or chalk mark) and line it up with the shoulder seam. Pin or clip the sleeve to the body opening, right sides together, spreading the sleeve evenly on each side. Sew the sleeve seam from the front panel to the back panel. Press the seam toward the sleeve.

Step Three: Sew the Side and Sleeve Seams

Fold the cardigan right sides together again, matching up the underarm points carefully. Sew from the bottom hem of the cardigan all the way up along the side seam and continue without stopping right up the sleeve seam to the cuff. This continuous seam is so satisfying to sew and keeps everything beautifully aligned. Repeat for the other side.

Step Four: Hem the Sleeves

Fold the cuff edge up by about three-quarters of an inch and press lightly. Sew the hem with a twin needle if you have one (for that professional coverstitch look), or simply use a narrow zigzag stitch. Stretch the fabric gently as you sew the hem so the stitches have the same give as the fabric and won’t pop when you pull the sleeve on.

Step Five: Hem the Back and Front Hems

Fold the hem up by about three-quarters of an inch and press. Sew with the same twin needle or zigzag approach as the sleeves, stretching gently as you sew.

Step Six: Attach the Front Band

If you’re adding the optional front band, fold each band strip in half lengthwise with wrong sides together and press. Starting at the bottom front hem of one side of the cardigan opening, pin or clip the raw edges of the band to the raw edge of the cardigan opening, right sides together. Work your way up along the front edge, around the back neckline, and back down the other front edge. Ease the band gently around the back neck curve. Sew with a half-inch seam allowance and a stretch stitch, then fold the band to the inside, encasing the seam allowance. Topstitch from the outside to secure the inner fold of the band. This gives you a clean, professional finish on both the outside and inside of the cardigan.

Tips for Sewing Knit Fabric Like a Pro

Even if this is your first time working with knits, these small habits will make a big difference in the quality of your finished piece.

Never pull or stretch knit fabric through your machine as you sew. Instead, guide it gently and let the machine’s feed dogs do the work. Pulling stretches the seam and causes wavy, distorted seam lines that are very difficult to fix after the fact.

Use a walking foot if your machine has one, especially for hemming and for sewing the front band. A walking foot feeds the top and bottom layers of fabric through the machine at the same rate, which prevents the top layer from shifting and stretching more than the bottom.

Test your stitch on a scrap piece of the same fabric before sewing your actual garment pieces. Check that the stitches aren’t skipping, that the thread tension looks balanced, and that the seam has good stretch when you pull it gently. If it pops, your stitch doesn’t have enough give. Try reducing the stitch length slightly or adjusting to a wider zigzag.

Press as you go. Each seam benefits from a quick press before you sew the next one. This improves your accuracy, gives your finished garment a more polished look, and helps you notice any problems before they compound.

Customizing This Cardigan Pattern

One of the best things about making your own clothes is the ability to adapt the design to suit your taste perfectly. Here are a few ways to make this cardigan your own.

Add Pockets: Cut two rectangles about 6 inches wide and 7 inches tall, fold them in half, and stitch them to the front panels before you sew the side seams. Position them roughly at hip level. Sew only the outer edges of the pocket piece to the front panel, leaving the top opening free. When you sew the side seam, the pocket will be caught in the seam naturally, and the top of the pocket can be topstitched in a small arc to secure it. It’s a simple detail that makes the cardigan endlessly more functional.

Change the Length: Draft the front and back panels to any length you prefer. A cropped version at hip length works beautifully in ponte or a heavier knit for a more structured, modern look. A floor-grazing version in drapey jersey is a stunning statement piece. The construction is the same regardless of length.

Add a Belt: Cut a long strip of your fabric about 3 to 4 inches wide and as long as you’d like the tie belt to be. Fold it right sides together along the length, sew, turn it right side out, and press. Add loops at the side seams so the belt slides through easily. This transforms the open, flowy cardigan into something with a completely different silhouette when you want it.

Try Different Neckline Finishes: Instead of the continuous front band, you can use ribbing at the back neckline only and leave the front edges hemmed separately. Or skip the band entirely and simply hem all the edges for a very minimal, clean look.

Common Mistakes and How to Avoid Them

The biggest issue new sewists run into with knit cardigans is wavy hems. This is almost always caused by stretching the fabric while sewing rather than letting it feed naturally. Slow down at the hemming stage and resist the urge to help the fabric along.

The second most common issue is skipped stitches, which are almost always solved by changing to a fresh ballpoint needle. Needles dull faster than you’d think, and a dull needle on knit fabric is the fastest path to frustration.

If your front band is coming out too tight and pulling the front opening in, you’ve sewn it with too much stretch. Ease off and let the band sit against the edge without stretching it. If the band is too loose and wavy, you may have stretched the cardigan edge while attaching the band instead of the band itself. The key is keeping both layers relaxed as they feed through the machine.

Finishing and Caring for Your Handmade Cardigan

Once your cardigan is complete, give it a gentle wash in cold water on the delicate cycle. Lay it flat to dry to preserve the shape and avoid any stretching that comes from hanging wet knit fabric. Most knit cardigans can also be very lightly steamed with a garment steamer rather than ironed, which is gentler and faster.

Store your cardigan folded rather than on a hanger, especially if it’s made from a drapey knit. Heavy, drapey fabrics can stretch out of shape over time when hung, and a long cardigan is particularly prone to this.

Final Thoughts

Making your own long open front cardigan is one of those sewing projects that genuinely surprises people with how quickly it comes together and how professional the result looks. Once you’ve made one, you’ll want to make a dozen more in different colors and fabrics for every season. The construction is simple enough to finish in a single afternoon once you have your pieces cut, and the reward is a garment that fits your body, suits your taste, and costs a fraction of what you’d pay for the same quality in a store.

Take your time with the prep work — accurate measurements, on-grain cutting, and a quick machine test on scraps — and the sewing itself will flow smoothly. Don’t let knit fabric intimidate you. It is genuinely forgiving, and small imperfections in a drapey knit cardigan are virtually invisible in wear.

Happy sewing, and enjoy every cozy moment in the beautiful thing you made with your own hands.