If you didn't select the dart option, gather the fabric by doing 2 or 3 parallel straight stitches through the seam allowance where indicated on the pattern.
The stiches should have a longer stitch length setting, and you must _not_ secure the ends by backstitching.
Keep the thread ends loose and long.
Hold the bobbin threads with one hand tight and bunch together the fabric with the other hand until
you've gathered the section to the same length as the distance between the notches on the back part pattern.
Secure the threads by tying a knot.
Repeat this for both sides.

:::note
There are lots of alternative techniques for this. If the difference between the lengths isn't that large,
you could simply adjust/stretch the fabric while sewing the side seam later. Or you could pleat folds manually and pin them in place.
Experiment with different methods on scrap fabric and look up books and tutorials for tips if you are unsure.
This is explained in more detail in the [Teagan instructions](/docs/designs/teagan/instructions#step-3-sew-the-neck-finish) and on [this page](/docs/sewing/knit-binding).
:::
Turn the main body piece right side out.
Place the knit binding piece _good sides together_ on the back of the neck,
matching the raw edge of the neck opening.
The solid line on the pattern (where the seam allowance ends) should be exactly at the center back of the garment.

Sew the neck binding to the main body piece.
The distance of the stitch to the raw edge is the width of the neck band
divided by four.
This is probably not equal to the standard seam allowance!
For example, if your knit band is 6 cm wide, sew 1.5 cm from the edge.
Place your presser foot 3 cm along the knit binding, so a 3 cm tail will be left unstitched.
This will help us join the ends of the binding later.
Stop sewing 3 cm before the end, leaving a tail like we did at the beginning.

Sew the tails _good sides together_ to close the loop, making sure the neck binding is stretched evenly.

Then sew down the remaining, unstitched length of the neck binding, keeping the same distance as before.

Fold the neck binding upwards and to the inside of the top.
This will create a fold at the stitch line you just created,
and another one at the original raw edge from the front and back parts.
Topstitch the neck binding in place from the outside.
The inside edge can be left raw if you're using knit fabric.