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5 Tips for Sewing Beautiful, Long-lasting Knit Garments

5 Tips for Sewing Beautiful, Long-lasting Knit Garments

Home   The Forget-me-not Patterns Blog   5 Tips for Sewing Beautiful, Long-lasting Knit Garments
tips

December 08, 2022

It’s no secret that we love sewing with knit fabrics. Almost half of Forget-me-not Patterns are patterns made for knits! Whether you’re sewing up a chic Viola, cosy Kirsi or an everyday Iris, this post has lots of tips and tricks to take your knits for sewing beautiful, long lasting knit garments.

Knits are versatile, comfortable and easy to wear. And with the right tools and techniques, they’re easy and quick to sew too! Today, we’ll be chatting about my favourite tips for sewing knit fabrics, as well as some handy tools to make sewing a little easier.

Flat lay of sewing supplies.


Now, I’ll be honest that some of these tips are not the kind of advice I like hearing. Why? It’s almost always about the prep work. I’ve found that most of the tips and techniques that have helped me level up my knit garment sewing game, don’t actually take place at my sewing machine. It may not be exciting, but it does make all the difference. So much of sewing beautiful, long-lasting knits happens in the preparatory phase. So let’s dive in!

Check Fabric Stretch

Possibly the most important factor in matching patterns to fabric for knit projects is making sure the stretch of the fabric is compatible with the pattern. Most importantly, the amount of stretch is going to determine if the finished garment will go around your body. Many, but not all, knit patterns have negative ease and rely on the stretch in the fabric, so check finished garment measurements too.

The other important factor with stretch is how the garment goes in the body. Since many knit garments don’t have closures, knit patterns are drafted with a specific amount of stretch in order to get the garment on over the head, hands, hips, etc.

Here are a couple things to check when determining if a knit fabric is right for the pattern in question:

  1. What are the pattern recommendations? (Note: All of our knit patterns come with fabric suggestions as well as recommended stretch percentages and body characteristics.)
  2. Check your fabric’s characteristics:
  • Weight - Is your fabric light or heavy?
  • Body - Does the fabric hold its shape or does it collapse with a lot of drape?
  • Stretch - How much does the fabric expand when stretched?
  • Recovery - When stretched, how well does the fabric return to shape?

Tip: How to check stretch percentage

There are several formulas for calculating stretch percentage. This one is my favourite.

Cut a 10 cm square of fabric exclusive of the selvedge. Hold one end at your ruler and stretch the other end as far as it will go. If the fabric stretches 11 cm, the fabric has 10% stretch (12 cm = 20%, 13 cm=30%, and so on).

Horizontal stretch is usually most important for tops and dresses. Check the horizontal stretch buy placing the ribs of the jersey (those tiny lines on the right side of the fabric) perpendicular to your measuring tool. To find the vertical stretch, which is often necessary for bodysuits, leggings and trousers, simply turn your square 90 degrees so the ribs and your measuring tool are parallel. 
 

Image showing how to check stretch percentage of knit fabrics

If your stretch percentage is lower than what the pattern calls for, you could check the finished measurements to see about sizing up and utilising ribbing for neck bands, cuffs and waistbands. If your fabric is stretchier than the pattern’s recommendations, you could consider experimenting with slightly shortening neckbands, cuffs and waistbands to make sure they can still properly stretch to fit those areas.

Tip: How to check recovery 

Checking for recovery is slightly less scientific, but still very helpful in determining of a fabric is going to be a suitable match for you pattern.

Start with the same 10 cm square stretch it as far as it can go along the crossgrain. Then let go and remeasure the square. A fabric that returns sharply to 10 cm is going to be great for most patterns. If your fabric measures over 14 cm, it may be better suited to looser fitting knit patterns, rather than something drafted with negative ease where it would likely end up bagging out.

 
Image showing how to check stretch recovery of knit fabrics

My lilac jersey measured 10.5 cm after being stretched, so I know I can count on this fabric to pretty much return to shape.
 
I was a little curious, so I pulled out a rib knit from my stash with the same fibre content as my jersey (95% cotton 5% elastane). Despite having the same amount of elastane, the result was very different. The rib knit not only had a higher stretch percentage of 60%, it also had signficantly lower recovery, measuring 16 cm post-stretch. It's a great illustration of how fibre content can tell you a lot about a fabric, but not everything.

 
Image showing how to check stretch recovery of knit fabrics

Test Your Stitches

For years, I would cut into my projects and jump straight into sewing them up. I always said to myself that I would stop and unpick if the tension wasn’t quite right. But what actually happened is that I’d get swept up in my project and not go back to unpick. This would often result in wobbly seams, damage to my actual garment pieces or having my garment fall apart on me after a few wears. Not worth it! So yes, it’s an extra step, but nailing your stitch tension can make such a difference in the final look of the garment as well as how long it may last.

Before you start, make sure you’re using a ballpoint or stretch needle, which will slip smoothly through the fibres and result in fewer skipped stitches. A universal needle may be fine on some sturdier knits, but the risk of skipped stitches is significantly higher.

Two scrap pieces of lilac jersey with three rows each of test stitches.

On a scrap of fabric, do a couple rows of test stitches. Choose between a zigzag or lightning stitch for construction. Additionally a twin needle can be used for hems (we’ll chat about that later!). Check to see if stitches are even and that your fabric isn’t being stretched as it feeds through the machine. Here are some common issues and how to troubleshoot them:
  • Machine is eating the fabric: Slip a small scrap of fabric under the edge of your fabric to give it a bit more stability.
  • Stitches are too tight or uneven: Try adjusting your tension. Consult your machine’s manual to determine if you may also need to adjust your bobbin tension. If you’re using an overlocker, your manual may have suggested settings for knits.
  • Stitches are skipping: If you’re already using a ballpoint or stretch needle, check your thread. Knit fabrics are a little more picky about thread and typically won’t tolerate thick or fuzzy thread. For overlockers, consider trying woolly nylon or seralon flex thread in your loopers.
  • Seams are stretched or wavy: Some waviness is normal and will steam out. If it’s still looking wobbly, you can try adjusting your presser foot tension or using a walking foot. On an overlocker, consult your manual about adjusting the feed differential for less pressure.

Two scrap pieces of lilac jersey showing different overlocker tension settings.

Cut on the Grain

We’ve probably all experienced the heartache of having our favourite t-shirt bag out or warp out of shape. So sad! Often this happens from either not pre-washing, the wrong amount of recovery, or because the fabric wasn’t cut on the grain.
Now, cutting the fabric on the grain may seem obvious, but finding the grain on certain knits can be tricky. Folding selvedge to selvedge is usually fine for a sturdy interlock, but may be deceiving on a shifty jersey.

Lilac jersey folded diagonally on a purple cutting mat.

For that my tip is to check that ribs of the right side of the fabric are all running parallel. It’s sometimes pretty squinty and I’ve been known to use a magnifying glass or a zoomed in photo to get a good look. If your fabric isn’t wanting to lay straight, find the direction of the warping and hang it in the opposite way to balance it.


Cutting Tip: using a rotary cutter and mat can keep slippery jerseys from shifting around while cutting!


Folded piece of lilac jersey with pattern piece, rotary cutter and pins.

Use Knit Interfacing


Bodice piece of a tee shirt cut in lilac jersey with knit interfacing at the shoulders.

I wish I’d known about knit interfacing when I first started sewing! It’s been such a game changer! Stretched out shoulders? No more! Wobbly hems? No way!

Knit interfacing is really light and gives just that tiny bit of support to shoulders, hems, plackets and button collars without getting bulky or stiff. My favourite knit interfacing (or “kninterfacing” as I like to call it) is Vlieseliene H609.

Rolls of Vlieseliene H609

It has great crosswise stretch making it great for waistbands on stretch wovens as well as knit garments. It does slightly reduce the stretch of knits, so don’t use it on neckbands or the waistband or cuffs of a sweater.

I love using it on hems. I love that it gently stabilises the hem while also giving it a little extra weight, which encourages the garment to hang a bit nicer. I like to cut strips the width of the hem allowance, so the interfacing is just on the one layer of the hem. I fuse the interfacing to the bottom edge of the hem.

Back bodice piece of a tee shirt cut from lilac jersey.

I love this step because I can skip measuring the hem! Since I measured the width of the strip, I can just turn the fused edge under. I even like to prepress it before sewing up the side seams so that I can speed through construction!

Finish with a Twin Needle

Flay lay close image of the neckline and shoulder of lilac tee shirt

Sewing nerd alert - I love practising with my twin needle! I love slowing down and meticulously topstitching a neckband. Don’t get me wrong, I love a zigzag, but there is something particularly pleasant about that parallel line of stitching at the hems and neckline of a me-made tee.
For a long time, I was too intimidated to try a twin needle because of the dreaded “tunneling.” When I finally tried it, it really didn’t take much more trial and error than other stitches on my machine. Sure, I had to tweak the tension a little, but definitely nothing to be scared of!

Flat lay close up of bottom tee shirt corner with twin needle stitching

Make sure your twin needle is specifically for stretch fabrics. Regular point twin needles are less commonly used, but they do exist and mixing them up can be a bummer - ask me how I know! Jo did a fantastic post full of twin needle tips. Check it out HERE and don’t be scared to try it!

Of course one blog post couldn’t cover everything about sewing knits, but hopefully this helps level up your knit sewing!
Do you have a special knit tip to share? Or perhaps you’re looking for help in a specific area? Let us know in the comments! We’d love to answer any questions you may have. Maybe it’ll even lead to more content on the subject. Until next time, happy sewing!


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