I'm trying to trace the source of this image,
https://imgur.com/a/uhVurMt

which depicts a soldier wearing what looks like trews. I received this image with no metadata via message, the person who sent this to me has no idea either and the usual reverse image searches don't show anything that fits.

I'd appreciate any help possible, since I'm not Scottish and I don't even know where to begin with military tartans. Thank you.