Prince Charlie Trews (Modern Douglas)
Pair the Modern Douglas trews with the Bonnie Prince Charlie jacket and waistcoat and wham, you have a seriously fine highland dress look on your hands. Trousers, Trews or Triubhas it doesn't matter, they're a mighty fine bit of kit and quite the black tie look.
For the trews, take a true waist measurement (around the belly button) as they sit higher on the waist. The belt isn't essential wearing as long as the waistcoat covers the top of the trousers. The low three button waistcoat means a bow tie is the choice of accessory.