In the history many men have worked bare chest , or shirtless. This was the case for farmers and miners. This was the result of the environment conditions such as warm climate, or closed and non ventilated areas.
But according to the times and in some places, and especially under the influence of the Victorian era (Queen’s Victoria reign from 1837 till 1901) the Western world deplored the male chest nudity and even the male swimmers were requested to cover themselves up.
The influence of such an attitude was also found in the British colonies, like India where some local costumes and religion are more tolerant on the topic. Fortunately the rule step by step disappeared in the 20th century, starting by the beaches and the swimming pools. It is now admitted to be shirtless in the hot days even in public places like shops and supermarkets.