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Engineers are part of the imperial college of engineers, and not part of the forces of an elector state. They might travel to battle for certain reasons ( field testing of their newest inventions most likely, and supporting the artillery ) but I'd assume they keep wearing their regular cloth.
They can propably choose to wear state colours though, or the counts/general might insist on it for some silly reason.
My engis are state engis, so they are in my colours, but there is no rule that they have to be, just makes my army look more uniform