Quote Originally Posted by freddie View Post
The Seaforth Highlanders did wear the Mackenzie tartan but in box pleats. The Highland Light Infantry wore the Mackenzie as knife pleats.
Thanks, Freddie. I believe the tartan is the same, just pleated differently. I've only ever heard the material referred to as Seaforth and assumed that identified the pattern.

The difference in pleating seems very similar to the OP.