This is a Tam, Floppy, or loose Beret style hat. I use Lion Brand Homespun yarn, but you can use any yarn that is a Bulky (weight 5) yarn. You can make it smaller if you use a smaller hook or larger by using a heavier weight yarn (it will take more yarn if you use a heavier one). I use about 1/2 a skein of Lion Brand Homespun yarn.