Interesting thread. I had no idea there were so many makers and styles. The one with the gold buttons are worn by officers and chief petty officers in the Navy, and also the Coast Guard. Silver buttons are for enlisted. I cannot speak for the Merchant Marines, but they are usually quite similar to the military. Plastic means civilian, but that's where the multitude of styles come in. The longer officer/chief style drapes well, and looks more dress than casual, to me at least. All styles work well as casual wear, IMO. All are warm.
This makes me want to dig around in the basement closet and find my silver buttoned peacoat. Been years since I wore it.
In work, do what you enjoy
In family life, be completely present