pea jacket
US /ˈpiː ˌdʒæk.ɪt/
UK /ˈpiː ˌdʒæk.ɪt/

1.
a short, heavy woolen coat, typically dark blue, worn by sailors
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He wore a classic navy pea jacket to brave the cold.
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The vintage shop had a collection of old military uniforms, including a well-preserved pea jacket.