This is done on the smaller 120 peg 3/8” gauge universal x loom, but you can use the larger gauge too. You might could make this on the larger 1/2” gauge but it might be more slouchy. You do wedge increasing and wedge decreasing. There is short rowing and a brioche style stitch pattern. I would say this is an advanced pattern but it has a video tutorial to help you make this easier to help you make the hat.
I used a pretty good chunk of a skein of Red Heart with Love yarn.