Navy blue. It's one of those neutral colors that is flattering on most everyone. It goes with every other color. It is perfect if black is too harsh on you. And, subliminally, navy says "success."
This two page ad for Rayon fabric from 1956 features 5 different navy blue dresses, all available at Henri Bendel. The hats are by Adolfo of Emme.
Above left: Sheath dress with short jacket by Rembrant.
Above right: Full skirt princess dress by Junior Sophisticate.
Left: Sheath dress with short cape by Highlight.
Center: Shirtwaist dress by Ira Rentner.
Right: Full skirted dress by Richard Cole.
Which dress is perfect for you? How do you wear navy blue?
Both photos from a 2 page advertisement for Rayon in Harper's Bazaar, 1956.