Do you keep the price tag on a hat or not?

It depends on whether or not you plan on keeping it. If you think you might want to return it, then you should leave the price tag on. If you plan on keeping it, then it's perfectly fine to take it off. If you are giving the hat as a gift, you should leave it on and also give them the receipt in case they wish to return it. Also, never pull off a price tag. You should always cut it off carefully because if you tear it off, some thread might come with the tag, and the hat could unravel. Here's another thing. Don't take off the tag until you have purchased it.