Are 'undershirt' and 'tank top' the same thing if we want to

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Are 'undershirt' and 'tank top' the same thing if we want to describe a type of undergarment worn by men? Is there any significant difference between them? - Quora

What is a good brand of men's undershirt? - Quora

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What are men's tank tops? - Quora

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What is a white tank top called? - Quora

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What distinguishes a 'blouse' from an 'undershirt'? Is the main difference the presence of sleeves? - Quora

How often do men replace their undershirts? - Quora

Is camisole an underwear? - Quora

Should you wear an undershirt under your pyjamas? - Quora