Douglas Harper's Etymology Dictionary
1721, loan-translation of North Frisian pijekkat, from Dutch pijjekker, from pij "coarse woolen cloth" + jekker "jacket." Middle English had pee "coat of coarse, thick wool" (late 15c.). Related: Pea-coat.
Wiktionary
n. pea coat
WordNet
n. a sailor's heavy woolen double-breasted jacket [syn: peacoat]
Usage examples of "pea jacket".
I had a week at most at my disposal, so for three or four nights I set off stealthily after dark, dressed in an ancient pea jacket and patched unmentionables, with a muffler and billycock hat and cracked boots, Galand in one pocket and flask in t'other, skulking round Conduit Street to see what his movements were.
The man in the turtle-neck sweater, wearing his pea jacket again-apparently he hadn't had time to stop for his cap-jumped out of the front seat.
Merrill, who was standing at the foot of the stage in his pea jacket and wearing his watch cap and gawking at the figure who beseeched us from the podium.
He pulled open the watertight door to the forecastle, and saw Stilwell in a pea jacket and wool cap crouched by number-one gun, tying down the blue canvas cover, which had worked loose and was flapping loudly.
Suddenly, this young drifter in a pea jacket and needing a barber was beside me.
Six feet tall, he guessed, give or take an inch, broad shoulders and narrow waist, wearing a seaman's pea jacket and blue jeans.