On closer inspection the pants have had major alterations to them. The legs have been professionally altered to make them a more skinny less jungle baggy. The alteration makes them look 70's period tight , almost Vietnam tigers style cut.
An alteration I guess not common as most soldiers use off the shelf trousers, it's the jackets that get modded.
I had a pair of trousers like this, years back-- that particular tropical, mustardy DPM. They were Canadian, if I remember correctly, and they also had a rather slimming fit. Like something out of an Anime. Very comfortable, but a little odd at first, since one expects them to be baggy.
Unfortunately, they're gone now-- otherwise I'd post the tags at least.