While Ripley looks like a simple hat, it really has a unique construction. The brim is worked sideways in one of two options: lace or garter stitch (which imitates a rib). From there, you pick up slip stitches and work upward. What's most interesting about the hat is its pleats. These pleats create a permanent scrunched look, perfect for slouchy hats. Here's an incredibly rough diagram that illustrates the construction:
For my hat, I'm knitting the medium size with the garter border. Here is my work in progress:
Here's an extreme close-up of what a single pleat looks like:
I'm hoping to get the hat finished up over the long Independence Day weekend. The pattern does give instructions for varying degrees of slouch, but I'm not sure what I'll go with yet. The advantage of bottom-up hats is that you can try them on as you go, so I'll decide on the fly. We'll see what happens!