Getting back to the holster image - both No. 3 and No. 4 are Canadian holsters for the High Power pistol ... or at least Canadian patterns.
No. 3 is a Pattern 1951 holster.
If No. 4 was originally tan/khaki webbing that has been blancoed green inside and out, then it is of WWII vintage ... i.e. a Canadian "Type F" or "No. 2" holster, as seen in these images....
(Click to enlarge ...)
http://i73.photobucket.com/albums/i219/GrantRCanada/Canadian%20military%20firearms/th_Inglis7aa.jpg[/pic]
http://i73.photobucket.com/albums/i219/GrantRCanada/Canadian%20military%20firearms/th_inglis7cc.jpg[/pic]
On the other hand, if No. 4 appears to have been made of green webbing to start with (as No. 3 clearly was) then it would seem to be a "green clone", so to speak, of the Canadian pattern .... (The British came out with a green webbing holster of this 'double flap' pattern in the 1950's or '60's, but it was not made of very stiff webbing like the Canadian Type F and your No. 4 - it was of a much looser/floppier construction ...)
For a
brilliantly researched and presented online illustrated article on 20th Century Canadian Military handguns and holsters (....

....) go here:
http://www.canadiansoldiers.com/weapons/pistols.htm
As noted in the article, the Browning High Power pistol, built by the John Inglis Co. of Toronto in 1944 and 1945, is
still Canada's primary-issue military handgun .... but presently-issued holsters are significantly different, being either open-top or flapped drop-leg designs, as worn by these Canadian personnel in Afghanistan:
http://i73.photobucket.com/albums/i219/GrantRCanada/Canadian%20military%20firearms/th_afingl16.jpg[/pic]
http://i73.photobucket.com/albums/i219/GrantRCanada/Canadian%20military/th_female10.jpg[/pic]
http://i73.photobucket.com/albums/i219/GrantRCanada/Canadian%20military/th_female09.jpg[/pic]
Mind you, judging from the many pictures I've seen of Canadian soldiers over there, the most popular carry method for the pistol seems to be in one of the chest pouches of the tactical vest ...
http://i73.photobucket.com/albums/i219/GrantRCanada/Canadian%20military%20firearms/th_afingl18.jpg[/pic]
http://i73.photobucket.com/albums/i219/GrantRCanada/Canadian%20military%20firearms/th_afingl14.jpg[/pic]