Ah, so YOUR inbred empire wears white.. Personally, I think a nice, crisp Royal Blue, with some gold accents, and while filigree would be more suited - but...
All this color diversity - just imagine how many variants they could sell to us in the store....
White IS the Empire, just look at the ships.
Black is the colour of those filthy federals, who are just copying all the other dystopian empires they are based off (the inbreds).
We at the Imperium use white because we are pure of sin. Black obviously means you are nefarious in your doings.
Although that's not to say blue isn't a nice colour to use too, as it represents calm and order, the order of the chosen that is the Imperium, to lead all others to the white light.
So I'll say again, actual Imperials wear white. But I'll point out, blue is allowed. But if you ever come to work dressed in black, then take your backwards ideology elsewhere, preferably the federation, in the army, so we can shoot at you for being a lesser being.
This has been approved by the Imperial Propaganda Division.