undervest

/ˈʌndərˌvɛst/
noun
  1. A piece of clothing worn under a shirt, usually sleeveless and made of thin material, to keep warm or absorb sweat.
    • He put on a cotton undervest before his dress shirt to stay warm in the cold office.
    • She bought a pack of white undervests for her son's school uniform.
    • Many athletes wear a moisture-wicking undervest under their uniform.
Synonyms
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