To start, make a few circles from your main color (see the circle pattern below).

Vary the sizes of the circles by working a different number of rounds for each one. For instance, I worked one 4-round, one 3-round, and one 3-round circle where I substituted half-double crochets for the double crochets in the last round.
Basic Circle Pattern
Make a magic ring, or start with a slip knot.
Round 1: Ch 3 (counts as dc), 9 dc in ring—10 dc.
Round 2: Ch 3, dc in same st, 2 dc in each dc around—20 dc.
Round 3: Ch 3, *2dc in next dc, dc in next dc; repeat from * around, ending with 2dc in last dc—30 dc.
Round 4: Ch 3, dc in next dc, *2dc in next dc, dc in next 2 dc; repeat from * around, ending with 2dc in last dc—40 dc.
Round 5: Ch 3, dc in next 2 dc, *2dc in next dc, dc in next 3 dc; repeat from * around, ending with 2dc in last dc—50 dc.
Note: You can substitute any stitch for the dc stitch if you are consistent (make the whole round in that stitch).
Usinga contrasting color for each circle, add a double crochet or half-double crochet edging to each circle.

To get the right stitch count, follow the directions for the next round of stitches in the new color (for instance, if your circle is 3 rounds large, add the edging following the round 4 instructions).

Arrange the circles as you wish and sew them together. For the top overlapping edge, sew under the V of the stitch of the circle on top and back through to the back side of the bottom circle. Turn the work over and sew the back sides together as well, making sure the yarn doesn't show through to the front.
Remember, you can arrange the circles however you want. I actually started with four circles, but it seemed like too much. My design is asymmetrical, but you might prefer a symmetrical design, or one where the circles cover the majority of the top of your head. You can do it however you want—go for it!

Sew the buttons in place. If the yarn you are using is too thick to fit through the button hole, try separating one ply (strand) and using that as thread. Alternately, you can use a coordinating color of embroidery floss.
Determine a "top" side to your formation (the side that will sit near the top of your head).

Note: If your edge starts to ruffle, you're adding too many stitches into the edge. If it starts to curl, you aren't adding enough stitches. Pull out a few stitches and try again.
At the start of your half-double crochet border, join the last stitch to the first with a slip stitch, and slip stitch in the next 2 sts. Ch 3 (counts as double crochet), turn, and double crochet in the next 4 sts. *Ch 3, turn, dc across. Repeat from * for as many rows as necessary until the headband's length (including circles) matches your head's circumference.
Remember that the headband will stretch, so you might want to make it 1 to 2 inches shorter than your actual head circumference. Alternately, you could crochet the band in single crochet stitches to make it slightly less stretchy
Fasten off the band, leaving a long tail for sewing. With wrong sides facing, center the band over the bottom circular part of the headband and sew the short edge of the band to the circular piece.
Once the headband is sewn together, slip stitch around the entire outside edge of the headband. This will keep the band from stretching too much
Now you're set to go in colorful style. Depending on your yarn, button, and placement choices, you can make this headband just right for you.
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