No, not really. Military trews are close fitting, as opposed to skin tight. They aren't as loose fitting as regular trousers, but still provde a fair amount of movement for things like sitting down! Mine are cut full in the seat, with maybe an inch or so spare around the thighs (I have 23 inch thighs and the legs of my trews measure just a tad over 24 inches). The suit trousers that I'm wearing right now have about 5 inches more fabric around the thighs-- my trews are also cut with a high waist and "fishtails" in the back. The trews also have no outside seam on the legs; just a continuous "inseam" reaching from cuff to cuff. Even here the tartan is a near perfect match.
Trews are not the same as tartan trousers, which are usually low waisted and fit like a pair of modern "Dockers".
If by skin tight you mean that the trews should fit like a modern pair of riding britches-- unless they were made out of some sort of "elastic" fabric, I doubt they would be very comfortable. I would also think that they would have a tendency to quickly become baggy at the knees and other stress points where the fabric would be expected to conform to the movements of the body without being excessively restrictive to movement.
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