I know what you mean Gustav, and I feel a little "blinkered" when it comes to painting figures in a campaign style. I believe I am lacking a little in the creative department and, unless the miniature itself has been sculpted that way, about the most I do at present is to throw a couple of replacement non-issue trousers into each unit (in the case of the Portuguese, some brown peasant-cloth attire).
It is something I have to work on, I feel.