Just a possible guess, because I wasn't there......allergy or sensitive skin issue?

I know a fellow who wears what seems to be too heavy clothing and a winter hat with a rear flap that covers the top of his head (which has rather thin hair) and back and sides of his neck, when the weather is sunny and hot.
His is so light-skinned that the sunburns he can get are quite serious. He said sunscreens that he's tried did not give useful protection, so he just suits up when he will be working outdoors for any length of time when it's hot.

Another fellow, very dark skinned (ebony), wears long-sleeved sweatshirts out in hot weather. The relative humidity is generally so low that evaporation of sweat is rapid for most of us, extremely rapid off his dark skin, and doesn't cool him with the sun bearing down on him. He suits up so that his clothes will get wet with sweat, and that longer period of moisture at the skin helps cool him.

Another one will wear thick long sleeves, sometimes, in hot weather, depending what dusts or pollens are present.
They don't affect him with difficult breathing, but the skin of his arms and back can get allergic reactions. As soon as he is out of the dust/pollen environment, he removes the thick clothing and showers, or hoses off outdoors, at least, if a shower is not readily accessible.