Chas, you are correct that neither of the Marine jackets mentioned here look like a Sherriffmuir. There still appears to be some confusion and I hope someone more knowledgeable will correct me if I'm wrong...

I believe the OP is talking about the Dress Blue jacket, which looks somewhat similar to a Kenmore doublet:


The image you quoted from Mickey is a Mess Dress jacket, which he clearly stated in his post.

This is why a picture is worth a thousand words and people should use more of them to help clear up confusion!