American men are conscious of sweat stains. When the Chelsea Handler Child Free And Crushing It Shirt in other words I will buy this weather is hot and you are sweating profusely, if you do not have an additional layer of shirt to absorb your sweat, your buttoned shirt will display wet spots all over off (primarily under your arms and back). Men are conscious of how they look with their t-shirt peeking out at the top. That is why some prefer to wear V-neck t shirts which provide the best of both worlds (sweat absorption but still appear to only be wearing the other buttoned shirt. We used to wear vests / undershirts until 1965 when white nylon shirts became popular. A vest was visible through the nylon shirt. That didn’t look cool so we stopped wearing them, so in cold weather, rather than freeze we would wear a white T-shirt underneath our shirts instead. Two years later n 1967 we started dressing like hippies so the collar and tie was discarded in favour of more casual clothing as we still wear today.
 
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