Pattern GYGBGBGGGBGYG

It is a 13 stripe tartan.

Colour Sequence

Tartans with this colour sequence

This pattern is a design lineage: every tartan below shares one colour order, whatever its owner — near-identical designs are grouped, the largest lineage first (#112: the pattern is a tartan's second parent, beside its family or clan).

U.S. Seabees (Military)