Trews or Tartan Trousers: Similarities or Differences?

[Padraicog]

My understanding is that modern trews unlike trousers only have seam on the inside of the legs. Trousers generally have seams on both the inside and inside of the legs; quite often there is a chevron effect on the outside leg with trousers which does not happen with modern trews.

Additionally the cut of each is different trews tending to have straight legs a la denims. To my mind trews are much smarter.