OK, I wanted to show "A" way of setting up a windproof smock. The Soldier '95 pattern smock is relatively cheap and available so it makes a good starting point. But it's needs some work, IMHO, so here's one way of going about it. Everything you see here was done on a single feed industrial, with no. 69 thread, and a #23 needle.
The first thing that comes to mind on a Brit smock is the zip. Why they insist on doing it bitch style is beyond me. But it's easily fixable. So a #10 YKK zip is installed, with the pull on the right side. I back it up with binding tape to make the joint stronger, but you could probably get by without it. Also, I cut the Velcro down to 1" squares, which I think is a good balance between staying put and getting them open.
On the top the zip goes all the way up to the collar/storm flap on the hood. The binding tape is folded over here and triple stitched.
On the bottom, I sew down the tail, right to the end, instead of leaving a small tail loose like the issue smock. I think it's just easier to zip up this way, in the cold with gloves on. Again the tape is folded under and triple sewn on the ends.