If you have loose ends, weave them in before proceeding.
Creating the Side Seam of the Hat:
Your first and last row should both be the same color (Color A.) Hold the first and last row together. Using color A, work one slip stitch through both loops of both the stitches in the first row and last row. The goal here is to form a tube. See a photo of this step to get a better idea of what I am talking about. In the linked photo, I used a contrasting color to enable you to see what I did; you won't want your join to be obvious, so please don't use a contrasting color here.
Gathering the Top of the Hat:
If you carried your yarn up the sides of your work, the carried yarns will be visible on one edge of the hat. That's what you want to use for the top of the hat. The other side, without the carried yarns, will be the bottom edge of the hat.
The next step is to thread your yarn needle and hand stitch a straight basting-type stitch loosely all the way around the upper perimeter of the hat. Make your stitches as even as possible, and keep them as close to the edge as you comfortably can.
Your next goal is to transform the tube into a hat shape that's open at the bottom and closed at the top. To do so, you're going to use your basting stitch as the mechanism for gathering the top of the tube.
After the top has been gathered, make a few extra stitches as needed to secure the gathers and then set the piece aside while you crochet the circle.
Instructions for How to Crochet the Circle:
Ch 5, sl st to form a ring
Round 1: 10 sc in ring; sl st to join to the first sc in the round.
Round 2: ch 1, work 2 sc in each sc, (20 sc) sl st to join
Round 3: ch 1, 1 sc in each sc (20 sc) sl st to join
I stopped there; the circle for my hat is made up of these 3 rounds. It measures about 2 1/4", and it is big enough to successfully cover the gathers at the top of my hat.
I worked out a couple of extra rounds for the circle, just in case you need them. Reasons why you might need them:
- If your circle turned out smaller than mine
- If for some reason your circle doesn't cover the gathers at the top of your hat completely when you try to stitch it onto the top of the hat
Don't use the extra rounds unless you need them, and do your best not to need them by gathering the top of the body of the hat as tight as you can.
Optional Round 4: ch 1, (1 sc in next sc, 2 sc in next sc) repeat sequence in parentheses all the way around (30 sc total)
Optional Round 5: ch 1, work 1 sc in each sc all the way around (30 sc total)
When you end off, leave a long tail of yarn that you can use to stitch the circle to the top of the hat.
Your next task: stitching the circle to the hat in such a way that it hides the carried yarns, the basting stitch, and all the gathers. You want this to be permanent, so stitch around the circle several times until you are confident that it won't work its way loose. When you are finished, turn the hat inside out and weave in the final loose end.
Turn it right side out, wear and enjoy.