McCall's B-3; 1970 (according to postmark); Evening Outfit
Dress has back zipper, skirt front has inverted pleat with underlay. Jacket is lined. Dress B has novelty trim.
It appears that this pattern was a free promotional pattern having to do with Punch Laundry Detergent and Baggies Plastic Bags.
Links to reviews/blog posts Edit
[insert your photos of this pattern made up]