The stitch pattern was relatively easy. I made an afghan years ago with a simple crocheted cable like this one. I no longer have that afghan or the pattern that I used, but I was able to recreate the cable after a few minutes of experimenting.
The hard part was the overall shape. I wanted a beret shape. Not a perky beret, but a slouchy beret. I wanted it to cover my ears, and I wanted to be able to tuck all of my (waist-length) hair into it; but I didn't want it to be enormous. So I crocheted and ripped and crocheted and ripped and set that one aside and started another, and crocheted and ripped some more--and eventually I had it, the almost-perfect slouchy beret.
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Now I just need to write down the pattern before I move on to the next project. I'd rather not, because pattern-writing is tedious, but I know that if I don't, I'll wish I had.