@affiliatetip - all the profs in my univ who wore baseball caps had a bald patch of crowning glory. the research said that tight fitting hats especially prevented enough oxygen from getting to the scalp and hence hair follicles have a shorter lifespan.
Then again, if the guys in your family hang on to their hair.s ... i'll check back in 10 years.
I don't mind my hair growing a little slower.
Hair today, gone tomorrow.
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"While dermatologists recommend a hat with a brim to protect the face from sun damage, that same hat can be causing damage to the scalp by preventing the proper amount of air circulation. Without it, sweat can clog up the pores in the scalp and cause hair growth to slow down or even stop. So if you want a thick, healthy head of hair, it might be best to go the sunscreen route for sun protection and leave the hat wearing for the cooler months."
source: http://www.ehow.com/how-does_4568841_wearing-hat-cause-hair-loss.html