Ww2 Canadian 2nd division greatcoat *info needed*

Hello everyone I was doing a little research on a ww2 Canadian Battledress that has come into my possession. I have a few questions about my greatcoat. If you guys have any feedback or information about ww2 greatcoats that would be greatly appreciated! I’ve been doing some research on my own, and was wondering why this greatcoat does not have the brass buttons typically found on Canadian greatcoats. I was also wondering what the inside bottoms were for? And this flap of material that is buttoned on the inside. It really makes me scratch my head... thanks in advance

Hello, I found the same brand of greatcoat (cook clothing) on the French web, with the same plastic buttons. It is dated 1945 but comes in size 6.
As I am new on this forum, I think I can't post pictures for the moment.