I would think this would be impossible to answer easily. My suggestion is to find someone that already makes hats and ask to watch him at his work. Also read, read, read. I hasten to add that the reason I say this is because I thought about doing the same thing. But the fact is hatmaking was an industry and it takes heavy industry equipment to do it well. Heavy duty sewing equipment, steam pots, complicated brim devices....etc. It looked way out of my means so I dropped the idea.