ha. Funny thing is, some years back, the Brits, who called the Donkey Coats, got seriously into USN pea coats. Apparently it was part of the house music fashion.
They were Donkey Jackets. Not unlike a Pea coat. Made in a fairly coarse material but with leather or plastic on the shoulders the help keep the rain out.
I too have a US surplus pea coat and agree they are fairly warm but not a patch on my Gloverall Royal Navy style duffel coat! Hardly ever get to wear that as it is so warm. Very comfortable though.
Gareth