I don't really have a pattern for this. But I'll try. Basically I'm sharing what I learned at my "purl and hurl" knitting group. And I'm not good with patterns anyway.
I cast on 84 stitches as that seems to be the size that fits me best. I used size 7 circular needles (I've never done a gauge swatch in my life so I can't tell you how that works... I just know when I knit on 8 it's too big on me but perfect fit for my friend!) And then for these hats I seed stitched for about an inch 1/2 to two inches. Ribbed looks good too if you want to try that. But the pictures above show seed stitch. Then switched to stockinette stitch. I had stitch markers every 12 stitches. And after about 3 to 4 inches started decreasing before each stitch marker till there was 7 stitches left. Break off a tail, thread through the 7 stitches and pull firmly and draw though to the inside of the hat. I'm not very good at that part yet if you look at the green hat you can kind of tell. I hope that is easy enough to follow. I'm a complete dummy when it comes to patterns.