Armchair,
For correct badging of the various Canadian Para Smocks I recommend basing your efforts on the smocks shown on my web-site. I did a fair amount of photographic research to ensure that they are correctly configured for their respective eras. The book "In Search of Pegasus" provided a very useful reference, as did several others.
The OD Green smocks are correct if left plain, or if badged like the "user-modified" version on my site. The badging on the latter smock is based on a 1950's-dated photo that I had, which clearly showed the composition (eg. post-WW II Battle-Dress ranks, Korea-era wings, white name-tape with stencilled lettering) and placement of those badges.
The "Reverse DPM" smocks are similarly badged for specific time-frames, based on direct photo evidence. The badging of the DPM smocks frequently changed over the years. The rank insignia went from the sleeves to the epaulet slip-ons, then back to the sleeves. The red and white Canada flag was worn only on the left shoulder, then on both shoulders, then (most recently) switched to the OD flag on the left shoulder only. Before the flags, the embroidered OD Green "Canada" tabs were worn on both shoulders. Placement of the Pathfinder badge, name-tape, Canadian wings, U.S. wings and foreign wings remained pretty much consistent throughout the DPM smock's service life. A Lerch pointed out, the German, French or British wings were worn on the right shoulder. Only one set could be worn, even if the individual was entitled to all three. A minor correction to what Lerch said however, is that they were always worn on the right shoulder of the Canadian smock - not necessarily where the host nation would wear them (eg. the French wear their wings on their chest)
I have never encountered a Canadian DPM Para Smock with a modified collar-facing, nor any other visible modification. They were kept "as issued" and standardized due to their use as more of a garrison jacket than an actual field smock. They were worn for jumping, but not used much in the field. The DPM smocks aren't terribly durable (the pocket snaps are always breaking), and they are prone to accelerated fading from normal laundering. Not good field kit.
The collar-facings were frequently replaced on the OG smocks because the original wool/felt facing material tended to wear out at the neck-line. That, and I'm told it was considered quite "fashionable" to have the camo nylon parachute material added for a bit of "flair". Same with having the waist elasticized for a more "tailored" appearance.
Some Canadian Airborne Regiment insignia can be purchased on-line from Joe Drouin's "Airborne Kit-Shop". Just do a Google search for "Joe Drouin Enterprises". That's where I got the Pathfinder insignia, and the OG Canadian wings. For the remainder (OG rank insignia, Airborne Regiment shoulder titles, etc) you will have to hunt around at militaria stores or gun-shows. You can try "The Supply Sergeant" store in Edmonton - they have a good selection of new-condition Airborne Regiment insignia. Pricey, but they have it.
For web-gear, the 64 Pattern is correct for both the OG Nylon smock and the Reverse DPM smock. The 64 pattern gear spans the service life of both smock designs, as it remained in Reg F service until 1982. The OG Nylon smock was used as late as the early 1970s, and the Reverse DPM smock was introduced in 1975. If you want the correct web gear to go with an earlier rendition of the OG Nylon smock, then you will need to source the 51 Pattern web-gear. The discussion forum at www.canadiansoldiers.com should be able to provide you with sources for the 51 Pattern gear.
The link to my web-site changed when I re-loaded the introductory page a few months ago. Use the links above to get there, then refresh your bookmark. Hopefully I'll get around to doing the update within the next couple of months. I'm kind of busy with other things right now, such as unpacking a garage full of moving boxes now that my basement is finally finished.....
Cheers,