Right then, I've took a bunch of photos here, hopefully the quality is good enough to show what I mean. Thanks to Mrs Spamel for modelling the garment, although she's a bit shy and didn't want her full face in the pictures!!
First of all, if you lay the smock out you will see the two cordages for adjusting the back of the hood and the long loop for the hood drawstring.
What you then do is flip the smock over and fold the hood towards the garment label, and tuck the drawstring underneath the fold. If you have a wired hood, tuck the ends back on themselves and out of the way.
Next, roll the hood from the top towards the label so that it is as tight as you can get it.
Then you need to tie the hood in place using the two drawstrings. Loop them through the loop above the label in the way shown. I've found this stops the strings bunching up and it holds the hood better.
Then pass the two loose ends up and over the top and tie the two ends together with a reef knot, but loop one of the strands so that it is a quick release by pulling on the end.
When you do the smock up it should be really snug and be a bit like a roll neck affair, stopping you getting a cold neck in the winter.
After doing the zip all the way up, the hood will be just about right, just quickly adjust it and it looks like this. Also, you can take the smock off and the hood will stay put. If it suddenly started snowing, reach back and take a hold of the string, pull and the hood comes undone. You then just unroll it, no snow goes down your neck and everything is hunkey dorey!
I hope the pictures and description is clear enough, and also sorry about how long it took to post this but my internet connection is a bit crap at the moment, no idea why. It took a while to put the pictures on photobucket!