Here they are! I've gotten a special rare post bed chain stitch machine just so I can embroider on hats. These are the kind they used to use at Disneyland before the digital take over. (If you want to bring in your Mickey Ears for something they wouldn't let you get embroidered at the park - hit me up)
Pick your hat blank, pick your thread color, and pick 1-2 words (or maybe three - I can fit 2 lines of text at 10 characters each).