Using DK yarn and 4mm needles, CO 29 stitches (I prefer long tail cast on)
Knit for 4 rows
Alternate knit/purl rows until hat is desired height
[K1,YO] for one row, ending with K1
Purl
[K1, M1] for one row, ending with K1
Purl
[K1, M1] for one row, ending with K1
Purl
Knit
Purl
Cast Off
Sew seam
Crochet or knit icord, or make a braid and thread through YO holes, tie to gather.