an outer coat, generally of a navy-coloured heavy wool, originally worn by sailors of European and later American navies. [...] References to the pea jacket appear in American newspapers at least as early as the 1720s, and modern renditions still maintain the original design and composition.
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she put on black jeans, heavy winter boots, a warm polo shirt, a dark pea jacket and matching knitted gloves, cap and scarf.
Stieg Larsson. The Girl with the Dragon Tattoo (Reg Keeland translation), p.113 (2009)
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The official detective was attired in a pea-jacket and cravat, which gave him a decidedly nautical appearance, and he carried a black canvas bag in his hand.
Arthur Conan Doyle. Sherlock Holmes: The Adventure of the Noble Bachelor