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Ben Cooper Inc. pretty much had a monopoly on Halloween costumes in the 70s. Ultra cheap to produce, the costumes usually consisted of a plastic mask and some sort of vinyl smock. Licensed characters including superheroes, movie monsters and film and TV personalities were popular. Rather than faithfully recreating the outfits of these pop icons, Ben Cooper costumes famously had the name (and sometimes the image) of the character printed on the front of them, presumably to make sure people knew exactly who they were looking at.
I don't have any of the stuff featured on the advertisement, but I managed to pinch a few pics from the net. Later, more characters were added to the line (like Leia and R2).
Here are some prime examples of the 'mask and smock' combo that one could expect from Ben Cooper Inc.