Hi Huolong! Gee, the one I wore in Vietnam didn't have a collar, just a simple zipper in the front, I don't remember any pockets, either. There were about 3 or 4 styles if I remember though, most did have the collar and the pockets. I was over there Jan 68 (right after Tet) to Oct 68, I was short when they sent me over. Funny thing is, the current BDUs don't look like a uniform you would actually fight in to me, looks more like something you would wear to a costume party. I guess I'm getting old!