What is the purpose of wearing a white shirt under a suit jacket? Is it necessary to also wear a white belt with pants to match the color scheme of the outfit?

What is the purpose of wearing a white shirt under a suit jacket? Is it  necessary to also wear a white belt with pants to match the color scheme of  the outfit?

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What is the purpose of wearing a white shirt under a suit jacket? Is it necessary to also wear a white belt with pants to match the color scheme of the outfit?

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