I remember seeing a picture in "Newsweek" at the time (I was maybe 8 or 9 at the time, so it was a long time ago). I recall that the uniform included a white tunic, same cut as an Army dress blue tunic, with an open collar, dark trousers, either black or dark blue, and I think, not a shako as someone else wrote, but a helmet of the old pattern the Army wore in the 1870s, pointed peak fore, broader peak aft over the neck, and I think, with a spike. We adopted the British version, which had been copied from the Prussian Pickelhaube after their victory over the French in 1871. (Many countries at that time abandoned the French military fashions that had ruled for the preceding 50 years, and adopted the Prussian style.)
I am working from my memory, now, 35 years later, so it is very fuzzy. But the tunic was definitely white, and the trousers dark.
Yes, Nixon took a major ribbing for that one in the press.
