Yes, the answer to Saturday's quiz is Bill Blass.
"A new incandescence of sharp-contrast colors, Bill Blass couples vivid Moroccan rose with saffron in cool-touch textured silk. Shapes them into a new look for after-dark drama, inspired by the mystery of Morocco and the native Caftan."
At this point, in 1964, Blass was the vice-president of Maurice Rentner and his name was on the label. He bought the company in 1967. It is interesting to see that as early as 3 years before buying Maurice Rentner, he was promoting himself and his name by joining with Cover Girl for their advertisements. There is no mention of Maurice Rentner in the ad.
Vivid colors such as these are just starting to show up in fashion, and will become all the rage in a couple of years time. It is interesting that Blass uses them for evening.