For one you get used to it. People who spend more time outdoors in the heat tend to sweat less.
Also T-shirts, wife beaters, and boxer shorts were originally invented as underwear, as in to be worn under other clothing. T-shirts didn’t start getting worn as outer wear until the 60’s when people started printing logos and slogans on them. Cotton T-shirts were used for this because they were cheap.
As underwear the cotton absorbs sweat and makes it more comfortable to wear a suit or whatever to wear over top. It also makes it less likely to have sweat stains on your suit jacket
Also suits weren’t worn by the working class when doing manual labor. That would have usually been cotton shirts and denim.
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