Re: The word is "P-coat"
"The term "pea coat" originated from the Dutch or West Frisian word pijjekker, in which pij referred to the type of cloth used, which was called "Pilot cloth", a coarse kind of twilled blue cloth with a nap on one side. The cloth was sometimes called P-cloth for the initial letter of the word and the garment made from it was called a p-jacket - later a pea coat"
http://en.wikipedia.org/wiki/Pea_coat
I just learned something myself. Isn't Wiki wonderful?