Originally I wanted to suggest renaming khakis into khaki_(color) - in order to distinguish it from same-looking artist tag.
However, I would like like to hear some opinions regarding specific shade of colour-related tag. I personally want this tag to stay active and populated, when brown or yellow-related tags aren't enough to describe certain colour of clothes, background, object, or any visual components of images. Having similar function just like the tag feldgrau to describe slightly greenish shade of grey.