Now that your decreases are done, you're ready to bind off your stitches and then weave in the ends. Binding off a hat is easier than almost all other garments, because you're not actually binding off anything at all, really. You're simply tying the end off by pulling the live stitches tightly together.
First, you'll thread the yarn end through your darning needle.
Second, slip the darning needle through the bump of the first cast on stitch - it will be a bit of a bigger bump than the other stitches because it was your slip knot.
Third, re-insert the darning needle, from front of the hat to the back, through the stitch the tail originally came out of. This will close any little gap between that first and last cast on stitch (as seen in 4 above), and will put your yarn back on the inside of the hat.
Then simply weave in this end as you did for the top end in the hat.
Once both ends are woven in - I like to weave the ends for at least a few inches, to keep them secure - simply cut both ends and turn your right-side out, so it's ready to wear!
Early next week I'll be sharing my finished hat photos! Be sure to ask any
questions you may have in the comments, and don't forget to hashtag your
projects #simpleslouchKAL on Instagram!