Chain 3, ss to form ring.
Work 12 dc in ring, ss to join. (round 1)
Chain 2, 2 dc in each stitch, ss to join (round 2)
Chain 2, *1 dc in 1st stitch, 2 dc in next stitch. Repeat from *, ss to join (round 3)
Chain 2, *1 dc in 1st stitch, 2 dc in next stitch. Repeat from *, ss to join (round 4)
Chain 2, 1 dc in each stitch around. ss to join. Repeat this round until hat is measurement you want.
I finished some with a lacey edge, which was 3 dc in 1 stitch, 1 ss in next, repeated around:
This one started to become huge, so I reduced some stitches, (dc in two stitches at same time) which gave it a beret look, so I added a bunch of dc around the ring at the top, and a few half-rows of sc in the front to give it a brim:
Some of these hats were wool, some acrylic, and some cotton. Again, I'm just using up old yarn.
While I was at it, I used some cotton yarn up making a dishcloth:
So have fun with this! CareNet or some other ministry would love the hats if you start making a bunch!