Erfworld 128 The Battle for Gobwin Knob, Page 116

[fendrin]

GK doesn't seem to have a coat of arms as such, more just colors.
Namely, red clothes with black armor. I skimmed the archives a bit and other than the warlord lineup and the main characters, I only found one case of GK units in 'uniform'. The first panel here shows (barely) a skeleton and a gobwin guarding the door. The skeleton has on a red shirt and black armor, much like Stanley's outfit on the same page. The gobwin has a short red one-shouldered tunic (like a greek exomis) with a black belt.

The grunts seem to wear just black.

Edit: and of course the plaid, but that seems to be reserved for ceremonial occasions.