This join I’m about to show you has to be one of my favorites. It leaves a flat almost invisible seam and is very easy to do. All you will need is a piece of yarn (usually in the same color as your project) and slightly longer than the length you are joining, a yarn or tapestry needle and your project pieces. If you would like to see a video tutorial of this technique you can click here.
To begin your mattress join, first you will put the two pieces you want to join together.
Then beginning at the bottom of your seam, you will insert your needle through the outside loop only of your bottom stitch. Come from the outside of your work to the inside when inserting your needle.
Note: It’s not important which side of the project you begin on. You can come in from right to left as shown in the photo below, or start on the left piece and work from left to right.
Now, bring your needle straight across and insert it through the outside loop on the same stitch on the second piece.
You can see when I pull the yarn all the way through I have made a straight line through my outside loops.
The next step is what distinguishes this stitch from others. You will now bring your needle up to the next stitch on the same side you just worked on and insert it in the outside loop only.
Now I will go through the outside loop again on the other piece I am connecting.
You can see when I pull the yarn though this second stitch that this stitch kind of weaves it way back and forth along the stitches.
Now I repeat the pattern, I go up one stitch on the same side I just came out of to insert my needle again.
I continue this pattern all the way to the end of my seam.
Now the magic, take your ends and pull them tight.
From the wrong side you can slightly see the yarn I used to join. If it was in the same color as my project, you wouldn’t even notice it.
Now for the front side, even with the contrasting color, you can’t really see any of the yarn I used to join the seam. And the piece is completely flat, no 3 dimensional seam here.
Once you finish stitching and seaming, just work these tails in as you would any other tail. If it’s the same color as your work you can easily weave it in. If you chose a contrasting color, you can weave in keeping it on the wrong side so it won’t show up through the front.