What posesses some old men to wear long sleeved button down shirts when it's warm out?

Long sleeve shirt tucked in of course with a belt and long trousers on. It's in the mid 50s here currently but later this week it will be nearing 80. I don't get it truly.

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Notanymore · 41-45, M

I actually work outside or fish or anything in a long sleeve cotton shirt. It holds sweat and evaporates slower, wich causes evaporative cooling. Also keeping the sun away is a good thing.