The only time that it would be "wrong" to display the clansman's badge in colour, would be if the Chief had directed otherwise.
This, I find perfectly reasonable. It makes much more sense than to have an overarching rule stating the clansman's badges can only be portrayed in B&W. And at the same time it honors the fact that the crest which makes up the badge is the personal property of the chief.

Sketraw:
The point is Mat, that the Clans Person is only allowed by courtesy of the chief to wear the badge in a Belt & Buckle as a metallic badge if it is reproduced in other media it should be in B/W to represent that this is the Clans Persons Bonnet Badge.
But how does rendering it in B&W represent the fact that this is the clansman's badge? Doesn't encircling the crest withint the belt and buckle bearing the motto serve that function?