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This was inspired by a hat in a book, but I have changed it enough that I think I could claim it was my own pattern. I added the earflaps, changed the geometry of the crown, and also changed the striped pattern. The stripes are made with stockinette rows alternated with reverse stockinette rows, so the reverse stockinette rows stick out, making those ridged stripes.
I like it so well, I would like to make a sweater with this detail at the collar and cuffs.