hi andybythesea, i was just using the term sas smock loosely as a lot people look at me blankly until i use the word 'sas', but i agree most were issued or opted for the denison, maybe due to the amount of ex paras entering the units not really sure. :-(
as i understand it there were several windproof smocks made circa ww2, all same layout, 3 variants of snow smock, one in green used for troops training in the highlands for winter warfare, made of very heavy material, when on deployment in snowy environments two more were made available, lightweight and heavy. heavy was basically just a white version of the green one issued for training. this is the one i have. silvermans had one left here is the link
http://www.silvermans.co.uk/Product...NORAK/ItemId/13797/CurrentPage/0/Default.aspx
then smock windproof drab was issued in mountainous areas, italy(ish), north africa for lrdg and raiding as you say. around the same time smock, windproof, camouflage was issued, have seen both these variants with the label saying suit or smock in the title.
All options came with matching trousers, but as far as i know, not the original green one used for training, though i don't know why they wouldn't have.
camouflage was reissued to 21,22,23 sas with zippers in late 60s early 70s, but i think more to in the terratorial and signals units. sbs i don't think stopped the circulation of these items from the time they first came in until dp took over, but not sure if the practise of putting zips in was as common as the other units.
on a seperate line i saw a reference to sbs also having sandy coloured pocketless smocks called smock,labrador but i can't find any images of this but wondered if you had heard of this one as it's something i'd like to know more about? i've seen a couple of them but don't know anything about them.
i did see some photos of i think an everest exped where they all took smock and trousers in camouflage but i can't find the images which is a shame, fantastic reference of how much equipment has changed in just the last half decade and further! scary stuff that they were considered cutting edge enough to take along!
mine came from silvermans years ago, paid £35 (wished i bought them all!) and still had its original bakelite buttons! they had loads of them all various grades, mine didn't come with it's label unfortunately (also the wrist adjuster isn't present on the snow smock and the sleeve just narrows slightly at the wrist).
i also have the camo repro which is ok, and the current desert copy they do which isn't very good, but is comfy and baggy, but they balls'd up the left arm on their entire supply and its a very thick cotton not lightweight as per original.
bloody nora i've droned on, much apologies, i'll go and take my tablets.