The New Shape Tiered Jacket

This is from a Modess ad in Life Magazine, February 1951. The often featured fashion in their ads, but this jacket is pretty terrific and I wonder if it was ever a real thing.
And don't miss the text...the box was "so cleverly formed that, when wrapped, it looks like one of a dozen purchases...never like a napkin box." So what did a napkin box look like before?