Worlds of the Imperium by Keith Laumer

I stood before a long mirror and eyed myself, not without approval. Two tailors had been buzzing around me like bees for half an hour, putting the finishing touches on their handiwork. I had to admit they had done all right.

I now wore narrow-cut riding breeches of fine grey whip-cord, short black boots of meticulously stitched and polished black leather, a white linen shirt without collar or cuffs beneath a mess jacket of royal blue, buttoned to the chin. A gold bordered blue stripe ran down the side of the trousers and heavy loops of gold braid ringed the sleeves from wrist to elbow. A black leather belt with a large square buckle bearing the Royal Swedish crest supported a jeweled scabbard containing a slender rapier with an ornate hilt.