CSM insignia/stripes etc.

Hey guys.I have a NNSH battledress tunic,but was wondering what insignia should be on it? To me it seems there are a few shaded areas that could have once had something there. I know there probably is a variety of markings,but seeing this fellow was an "original" NNSH who was a D-Day Veteran as well as making it to the end of the war, what SHOULD be the minimum accoutrements on his bd?
Appreciate opinions...thanks!