I'm a really big Twin Peaks fan and have been for many years. When I saw the new episode where Jerry is talking to his brother Ben while wearing a knit hat, I just had to try to reproduce it. In this scene, Ben asks Jerry if he's wearing their Mother's hat. Made me chuckle.
I knit the hat with alpaca and wool yarn, some of it I dyed, some is natural. It is generous and should fit just about any head, man or woman.
Without stretching, it's 20 inches / 51 centimeters around the rolled rim bottom, and 9 inches / 23 centimeters tall.
To wash, soak for about half an hour in hot water with a dash of soap (Dawn works fine). Squeeze water out gently and soak in warm water to rinse. Lay flat to dry. To prevent shrinkage avoid agitation and extreme water temperature changes.