Here are some photos above taken from a Penneys catalog circa 1967. Evidently, it was incredibly popular to stand out in the crowd by wearing adult outfits that were akin to being dressed like 2 year old twins. That's right, no need to wonder who is with who at that shindig when you are dressed in matching clothes. Yes, there is no better way to get people to back off when you don't have to audibly say he or she is mine. It's clear. We get it. Nice to meet you two.
While we find this wildly amusing today, it's a fashion statement we would be quite surprised (and horrified) to ever see a successful revival of.