This is the hat Rod made.
The original Rod's Duck Farm Hat is made is made of blue denim.
It was made using a 1950's Japanese version of a Singer sewing machine (Admiral).
Probably Rod's Duck Farm hats should be made from a cotton weave known as Duck Cloth. Duck cloth is similar to canvas.
Likewise, machinist hats should be made from a different cotton weave known as Drill Cloth.
Drill cloth is similar to a Trigger weave, also similar to denim, very much like the heavy striped material used as a feather container - the old down-stuffed pillows.
The hat is shaped using starch and drying frame.
The other side of the hat has bird poop on it, a reminder from a pet peregrine falcon. Rod found a disoriented peregrine falcon in a parking lot. The falcon was kept in the machine shop for a couple days. Then the falcon was ready to head out into the world again. (A slang name for peregrine falcons is Duck Hawks - they dive-bomb into their prey, hitting the hapless victim with a peregrine breast. )
The hat is sort of a duck hat - it has a big bill.