No. That my friend is an age-old myth!
Many have come to this false conclusion simply because of the association of the temporary mark or crease that sometimes results around the head from where the hat has rested. Rest assured, the only way for any significant damage to take place is to wear the hat so tight AND so many hours, that circulation is cut off to the hair’s follicles.
How many of you would consider purchasing, let alone wearing, a hat that would cause this much discomfort?
Yeah, me either!
So enjoy your hats, and wear them often and in confidence, knowing that your hairline will be just fine!