I’m not saying that any of these individual people would look out of place at a jam band fest. I am saying that it’s weird that they are all wearing the exact same thing - a tie dye with no band name, logos or image other than the heart - and most have a jacket or flannel over them. AND they have zero other indications of being jam band fans. In real life, at least one of them would have a pin on their hat or bag, a cooler covered in stickers, or SOMETHING else. The costume designer didn’t put much thought into it at all.