How to Sew Knitted Sweater Pieces Together: What Do You Need?

HomeTechniquesHow to Sew Knitted Sweater Pieces Together: What Do You Need?

If you need to shorten a knit sweater, there are a few things you’ll need to do. First, you’ll need to unravel the sweater up to the desired length. Then, you can reknit the ribbing or bind off the bottom. This will create a neat and tidy finish that looks great and fits perfectly.

Do you want to create something special with your own hands? If so, then why not try sewing knitted sweater pieces together?

With the right tools and a bit of patience, you can make a beautiful piece of clothing that’s all your own. Imagine how proud you’ll feel when you put it on!

By following this guide, you will learn how to sew knitted sweaters pieces together using a mattress stitch and tapestry needle. So let’s get started – let’s make something truly unique!

Gather the Necessary Tools

To successfully join your knitted sections, you’ll need a few tools – a tapestry needle and some thread – so grab them before you get started.

Choosing the right yarn is also important; look for one that’s durable and matches the color of your project. You may want to use multiple strands of yarn if it needs to be thicker and stronger.

Additionally, make sure you measure the fit of the pieces before sewing them together; this will help ensure everything lines up correctly when joining them.

Lastly, double-check that all edges are lined up evenly before starting to stitch together with your tapestry needle. This way, you can guarantee that your knitted sweater pieces will look great when put together!

Prepare the Pieces

Get your knits ready for assembly by lining up their edges – it’s almost time to join them! Before you get started, make sure you have all the necessary supplies like ironing boards and pressing cloths or supplies. You should also ensure that the stitch length is correct on both pieces and that they’re properly secured if needed.

In order to properly align the pieces, there are several steps to follow:

  • Prepare the Pieces: Get your knits ready for assembly by lining up their edges.
  • Ironing Supplies: Make sure you have a steam iron and pressing cloths to press out any wrinkles in the fabric before assembling.
  • Stitch Length: Determine which stitch length works best for your project and adjust accordingly on both pieces of fabric. This’ll help keep your seams consistent.
  • Positioning Pieces Together: Lay out the two pieces with right sides together so that the edges match up perfectly before stitching them together.
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Once everything is set, it’s time to sew! Be sure your needle is threaded securely and start stitching together from one end of the fabric to another in an even motion until all sides are connected.

Take note of where each piece of fabric starts and stops so that when you go back over it again later, everything lines up properly. With careful attention, you can now transition into begin stitching without having any gaps between seams or puckers in the sweater body itself!

Begin Stitching

Now that your pieces are in place, you can start stitching them together to create a knitted masterpiece!

To begin, the most popular seam technique when it comes to knitting is the mattress stitch. This method is best for vertical edges and involves using a tapestry needle to sew two pieces of fabric together with yarn. Depending on the type of yarn you use, the color of the stitches should match or contrast with your project for an aesthetically pleasing look. Consider using a contrasting yarn if you want to make sure that your stitches stand out from the fabric.

To begin sewing, line up both pieces side by side with right sides facing outwards and wrong sides facing each other. Starting at one end of each piece, insert the tapestry needle into the edge stitch on one piece and pull all the way through so that both ends are even. Make sure not to pull too tight as this could distort your work.

Next, insert the tapestry needle into the edge stitch on other piece and pull all through until it meets up with first end and tie off securely underneath before continuing along next row. Keep repeating this process until each piece has been fully attached together – remember to keep tension consistent throughout each row!

When stitching around curves or corners, take extra care when inserting needle into edge stitches so that everything lines up correctly without any gaps or bunching up of fabric. You may need to adjust tension slightly if needed – just make sure it’s not too tight otherwise fabric will pucker or become distorted!

Once finished sewing along entire length of fabric, secure off any loose ends by weaving in tail underneath stiches before snipping off excess thread from backside of project.

With careful attention given during stitching process, you’ll be able to hide seams between two pieces seamlessly for a neat finish every time – congratulations on making it this far!

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Now onto continuing stitching until desired shape is achieved…

Continue Stitching

You’re almost finished with your masterpiece! Keep going and you’ll soon have a knitted creation that will take everyone’s breath away.

To continue stitching the pieces of your sweater together, it’s important to reinforce the seams by working through edge stitches with a tapestry needle. This ensures that all stitch patterns are uniform, secure, and look great.

Additionally, you can use a mattress stitch for joining seams on stockinette stitch fabric as it creates an invisible seam once complete. The process involves inserting the tapestry needle in between two sets of loops from both pieces of fabric and then pulling them together until tight before repeating this step with the next set of loops.

Be sure to keep your tension even all along the seam so that it looks neat and tidy when done. If you find any errors or mistakes in patterning while sewing up, make sure to pick out stitches carefully using a crochet hook or blunt needle.

Once completed, weave in any loose ends using a blunt needle or crochet hook to ensure they don’t unravel after wear and wash cycles over time. You may also choose to use thread reinforcement at stress points such as armhole and neckline openings for extra durability if desired.

After reinforcing these areas properly, you’ve now successfully sewn up your knitted sweater pieces together! Now onto finish the seam…

Finish the Seam

After the seams have been reinforced, complete the look of your masterpiece by finishing the seam with a neat mattress stitch for an invisible finish. A mattress stitch is one of the essential sewing techniques that are used to join two pieces of knitted fabric together. It’s a great way to make sure that your garment looks seamless and professional when you’re done.

To begin, you’ll need to thread a tapestry needle with some yarn in a coordinating color. Then, you’ll want to start at one edge of your sweater piece and work through each edge stitch with the tapestry needle until you reach the other side. Be sure to keep your tension even as you go along—this will help ensure that your stitches stay neat and consistent throughout.

Once all of the edges have been joined, it’s time to make sure they stay put! You can do this by using variations of simple stitches such as whipstitches or slip stitches on either side of where your pieces meet. This step helps reinforce the area so that it won’t come apart over time.

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Finally, weave in any loose ends from your yarn before moving onto blocking the sweater for its final shape. Blocking helps set in all those stitches and ensures that everything stays in place after being worn and washed multiple times!

With just these few steps, you can easily create beautiful garments with mattress stitch seams for a professional-looking finish every time!

Block the Sweater

Once the seams have been secured, finish up your project by blocking the sweater to give it a polished look.

Blocking is a crucial step that helps to shape and size your garment, as well as show off any stitch patterns or decorative details. The right yarn selection also plays an important part in this process; choose a yarn with good drape and elasticity to ensure the most even results.

To begin blocking your sweater, dampen the fabric either by soaking it in lukewarm water or by spritzing with a spray bottle until wet but not dripping. Then lay the garment onto a clean surface such as a beach towel or yoga mat and shape it into its desired form using pins or wires if needed for shaping techniques like armholes and necklines.

Leave it to dry completely before unpinning any tensioners or taking away any wires used for shaping. When finished properly, blocking should make your knitted sweater appear more professional and give you confidence that all of your hard work has paid off!

With careful attention throughout each step of the process from selecting yarns to sewing pieces together – you’ll be left with beautiful results that can be enjoyed for many years!


Congratulations, you’ve now completed the sweater! You’ve taken two pieces of knitted fabric and stitched them together to create something beautiful. It’s a great feeling to have accomplished such an intricate task with ease.

With just a few simple steps, you’ve created something that will keep you warm and make your friends jealous. Now all there’s left to do is show it off! Grab your needles, gather some yarn, and get ready for a world of crafting possibilities.

With the skills you’ve learned today, the sky’s the limit for what can be created with needle and thread.

Katherine Pearce
Katherine Pearce
Katherine Pearce is a knitting enthusiast and the founder of With a deep passion for the craft, Katherine aims to make knitting accessible to everyone, regardless of their skill level. Through, she provides online tutorials and resources to help others discover the joys of knitting and develop their skills.

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