Ethics and courtesies of branching into other tartans?

[Bad Monkey]

Most of the kilted brothers around here not in a pipe band wear either a family / district tartan, the Wisconsin state tartan, or the Freemason universal. Pipers around here seem to have all standardized on Royal Stewart so they end up looking like a rather noisy pile of Walker's shortbread biscuits.

FTR, the only Masonic kilt kit I have is a silver sporran chain that I really only wear to black tie events with the evening dress sporran.

FWIW, Walker's uses the Grant tartan on their packaging...