Mine does, and it's not ventile. (or gaberdine) It is 100% cotton. It uses long stable fibres. It has 30% more cotton than normal, it goes stiff as a board when wet and it takes a good few hours of steady rain before it soaks through, but it's not ventile. .....
Your description, which I believe comes from the SASS site is almost exactly the same as as the description of Ventile on the Talbot Weaving site.
And the performance and characteristics sound right also.
As far as I am aware the OG fabric that SASS are using is ventile purchased from a company that had gone bankrupt (sp?) .
I would suggest that as they didn't buy from Talbot they are reluctant to market it as such( they can't prove it )
The Sand coloured material that they also offer the jacket in (so I'am told) is the result of a contract which they filled for an American Security company.
I think they were so impressed by the material that they sourced new stock from the US.
I have samples of both the OG and Sand coloured materials and they are both quite different.
The OG is definately heavier and more dense than the Sand.
Oh, I have a SASS smock in OG btw and I am mightily impressed with it, it's features and build quality.
When you consider it's price, it is no brainer IMHO.