Hats and Hair Loss

My question is: can hats cause baldness? I have heard that they are in no way related to losing your hair unless they are too tight and cut off circulation. However, I heard someone explain that if you wear a hat, sweat can accumulate in your hat, and your sweat contains DHT and if you have a predisposition to Baldness all the DHT coming into contact with your scalp can make you lose your hair even quicker than normal. Any truth to this?

I was on a TV program a few years back called the Big Urban Myth Show on MTV and answered this very question. Hats causing hair loss is an urban myth. Men wear hats to cover their baldness.

So to repeat — hats do not cause hair loss.