I need to get another, and larger, Navy WP to wear under my peacoats. It's a good look for me.
I might give some word for a white RN roll neck jumper to match your naval peacoat.
Looking for same to go with my gloverall coat. A consistent nautical line wear. An olive drab jumper
goes quite well for other coats associated with hunting, campus, whatnot, but looks a road block
when worn able bodied seaman kit. Just a penny pitched at curb side.