If the finished hat is for a child up to the age of 13, it must have a CPSIA tracking label. It will not need a FTC label.
If the hat, is strictly a hat, and for an adult, it will not need any FTC labels. BUT, if the hat comes down to the shoulders and covers the neck, it may also be a scarf/cowl, which would need FTC labels. So, on top of the head, hat, around the neck, shoulders, not a hat.