The hat is 59 stitches in circumference, knit with a stockinette stitch at a gauge of one stitch per centimetre.
From the en.wikipedia.org
Structure of stockinette, a common knitted fabric.
From the en.wikipedia.org
He created frames from fiberglass kite rods connected by tape and covered them with a light cotton cloth called stockinette.
From the nytimes.com
On the wrong side, the ends of the loops are visible, both the tops and bottoms, creating a much more bumpy texture sometimes called reverse stockinette.
From the en.wikipedia.org
The fabric produced using a knitting machine is of a more even texture than hand-knitted fabric, which is particularly noticeable on large areas of plain stockinette stitch, and can be an advantage.
From the en.wikipedia.org
More examples
Stockinet: knit used especially for infants' wear and undergarments
Tubular open-ended cotton or nylon material.
A cheesecloth sack that lots somewhat like a stocking in which a cured bone-in ham is placed to be cooked and smoked.
The most basic knit, which has the appearance of interlocking V-shapes on the front and interlocking crescent shapes on the back. See also plain knit.
A term sometimes used for soft, plain stitch, knit jersey used for underwear & other apparel.