Forest-green and Atholl navy carry the field; pastels are inadmissible. The ground decides which Highland family the cloth can claim before a single over-stripe is laid.
Every sett mirrors around its centre thread — G6 K6 G6 B24 G6 K6 G6 and back. An asymmetric sequence is decorative plaid, not heraldry, and the register refuses it on intake.
The thin yellow rule appears once per sett, never twice — a single weld-dyed yarn that lets the eye fix the centre of the pattern at forty paces across the parade ground.
The block tiles cleanly from a six-inch waistcoat pocket to a fifteen-yard great-kilt. If the geometry breaks at any scale, the weaver returns to the warp and re-threads from centre out.