Get the perfect invisible seams on your knits with this technique

I have to admit, I used to hate seaming. When I first learned how to knit sweaters, I avoided seaming at all costs. I only chose patterns that were knit in the round in one piece with faux raglan seams. The trouble is, this limited my pattern choices and I was finding all kinds of sweaters and other projects that I wanted to knit that involved the dreaded seaming. Once I finally bit the bullet, I realized that not only is seaming easy, but it can be a nice meditative way to finish up a project (and one more thing to do before sewing in all those dreaded ends).
The patterns below are for both a half stitch weave and a whole stitch weave (also known as mattress stitch). Combining these two techniques will give you a neat, invisible seam up the side of a stockinette stitch sweater with 1x1 ribbing on the bottom edge. If you prefer the look of a visible seam, simply use the half stitch weave up the entire length of the sweater. Some garments, even those knit in the round without seaming, incorporate a visible seam (or faux visible seam) like this. It’s all a matter of taste.
Check out the video tutorial below from Anonyknits:
Tapestry Needle
Yarn from the body of your sweater (1.5 to 2 times the length of your seam)
Pro Tip: If you know you have a side seam to knit, leave yourself and extra long tail when casting on (1.5 to 2 times the length of your seam) and use that tail yarn to create your seam.
k - knit
p - purl
sl- slip
st - stitch
Written Pattern
Half Stitch Weave
Holding the two ends of your work together with right side facing you, locate the first (in your left hand) and last stitch (in your right hand) of the row. Using your reserved tail yarn (or a new length of yarn), thread the tapestry needle. Pass the threaded tapestry needle through the first and last stitch on your cast on edge and pull it back through either stitch. Insert the tip of the tapestry needle under and behind the bar in the center of the first (edge) stitch on your left-hand needle. Pull the needle and yarn over the top of the bar and through the stitch. Repeat with the last (edge) stitch on your right-hand needle. The stitches you seem together should always be the first and last stitches of the same row. Repeat Half Stitch Weave, alternating between left- and right-hand stitches until you reach the stockinette section of your sweater, ending on a right-hand stitch.
Whole Stitch Weave
Rather than picking up the bar in the center of your first and last stitches, you’re now going to move your seam yarn over half a stitch. Insert the tapestry needle between the first and second stitch on your left-hand work and pick up the bar between to two stitches (sewing from below and behind the bar as before). Repeat on the right-hand work, picking up the bar between the last and second to last stitches. Repeat until side is fully seamed.
Resources anonyknits

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