Checking on some references, I came across a bit of a disconnect between the sourcebooks and the fiction:
FM: ComStar lays out the following color coding for ComStar's robe/ranks:
Acolyte: White
Adept: Yellow
Demi-Precentor: Green
Precentor: Red
Precentor Martial: Entitled to red, but in practice, white.
However, the Stackpole books show the following:
Acolyte: Yellow
Adept: Not mentioned
Demi-Precentor: Red
Precentor: Red
Precentor ROM: Black
Primus: Anything they wanted - Dun/Tan (Tiepolo), Gold (Waterly) and Gray (Mori)
Did Focht & Mori change the robe coloring scheme after the reformation (explaining the differences)? And would that mean that the traditionalist Word of Blake used the Stackpole mix (yellow for Acolytes)?