Forgive my ignorance. What is an 1898 hat? How does one decipher the spreadsheet? What are the columns? What are the rows? What is a provisional stitch? What does graft center seam mean? Maybe I should just buy a pattern (or go away quietly).
A provisional cast on is one which is later removed in order to graft/Kitchener stitch the live stitches seamlessly. I don't favour it for this project, because it's handy for the wearer to have a visual or textural indication of which is the back of the hat. It's a free pattern:
It's a uniquely designed hat that is really great for such things as shovelling snow in or after a blizzard in deep-freeze temperatures.