The pattern consists of a central motif and two smaller motifs on the sides. I use Italian/tubular cast-on method.
You can change the size by changing the size of the needles.
And you can change the height of the hat by knitting more or less repeats of the pattern in height before starting the crown, this way you can have a normal beanie, or a slouchy one.
You need 2 colors of yarn, less than 1/2 skein of each color.
I did 3 repeats of the pattern in height and I used 40g of each color yarn, so 80g total.