Why does Cartman have his hat off more than the other boys?

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How come Stan, Kyle, and Kenny don't show their hair as much as Cartman?

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It's been several seasons now that Cartman has been seen without his hat on. I am not going to research this, but I remember in Casa Bonita, when Cartman puts on a nice sweater, he had no hat on. And many other episodes too. So it is nothing unusual for Cartman to not wear his hat as much as the other boys.

Kenny usually has his orange gear on. Some exceptions: when he first was out of his suit, he was shown to have yellow hair; in Michael Jackson Spoof, he dressed up like "Blanket," again with his yellow hair. In the kindergarden scene, where the bully was being released from juvenile hall, he had his face covered, but again yellow hair.

Kyle first had his hat off in Picture Day, where we learn he has red hair like his mother. Stan has had his hat off, particularly when he was exhausted when he saved all those little veal/cows.

And of course in School Action News, they all wore News Hairpieces, and not hats.

But all in all, Cartman has his hat off the most.

Just my observation.