I have a cousin who started going bald at 18. As you can imagine, it was rather upsetting to him, and he hasn't been able to be comfortable with his lack of hair, not to mention he is fair-skinned so his head sunburns easily. He teeters back and forth between wearing a baseball cap to hide/protect his head, and taking it off to be good-mannered. I realize that for him, walking around without a hat, even indoors, is about as embarrassing as it is for me to discover that my shirt has hiked up and my pudgy tummy is on public view.
I'm just glad that covering one's stomach, or upper arms, is always socially acceptable!
I also have a friend who had a cancer on the back of his head, and his scalp from the ears back had to be removed. As he says, it's no problem to him, as from the front, he is still the same studly young man he always was.
It's only people who see him from the back who are startled. He tried wearing a toupee, but quit after his wife told him it looked like he had a dead rat tied to the back of his head.
And then there was the time I had a hemangioma removed from behind my left ear. A kindly nurse carefully shaved my head so I could do a comb-over to cover the bare spot. But if I'd had a nurse who was harried and hurried, or who'd been intimidated when the surgeon told her to shave a bigger area, I probably would have wanted to wear a hat all the time til my hair grew out, too. And once I had to go to a job interview 2 days after having been in an accident and getting 2nd degree burns on my face. On the way to the interview, the Silvadeen cream TARNISHED, and I showed up with a blackened greasy face. No way to hide that, I wasn't about to scrub the Silvadeen off or apply makeup on a fresh burn.
I'd give the interviewer the benefit of the doubt. There are all sorts of medical reasons why a person might think wearing a cap would look better than baring his head.