A true pleasure to exchange words about lore with a well-versed SW connoisseur (really, not joking)
Just been digging a bit more on this, and you're right. According to
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, all-white uniforms were mostly exclusive of Grand Admirals, while in the Behind The Scenes section they mention that white uniforms with black trousers were also tailored for the Intelligence community.
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white attire is expected, as the
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department which he directed belonged to
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and to the
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during the
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.
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mention that his uniform is based on those of the ISB indeed, inspired on the one wore by
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(a high ranking ISB officer from A New Hope, and additionally as a dramatic resource to contrast with Vader all black suit).
About COMPNOR... The
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was in fact one of the two main sub-branches of COMPNOR internal structrure (dealing with Intelligence), while it's sister
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is the other one (focused on propaganda and behavioral sciences).