I no longer believe this uniform is strictly Latvian. It has Ukrainian stamps, the spec. code for the uniform is from the Soviet Afghanka and it came from the Ukraine.
So the pattern was distributed more widely than initially suspected. It may have even had a Soviet origin.
Here's my unissued set, still with paper tags, writing, and tailor's chalk on some pieces, namely under the pocket flaps. It also had the left and right leg cargo pocket flaps swapped; one leg pocket has a three-button closure and the other two.
And some reference pics of the older, non-digital/recent patterns: