Actually, I should change that post title because if this pattern is old then that makes me old too. I just happened on this awhile back on Etsy. It's a sewing pattern, and it just happens to be the same pattern I used to make my high school graduation dress! That was a surprise to see. I made the short version and used a pale green dotted Swiss with white trim. I wanted pink, but the store didn't have enough-- there was a lot of fabric in that skirt, so I settled for green. I wore that dress a couple of times after graduation then passed it along to my (younger) sister-in-law years later who probably never wore it.
Have a nice day out there!