Mystery solved...

[jennisis]

Apparently, though it doesn't say it on the website, the pattern comes stamped with the statement: "Original 1944 design".

Comments

[greyweirdo]

That's a year or two earlier than I would have pegged it at if I'd been forced to pick a date.

[coltsbane]

I still maintain that it's totally an 80s design. Just Add Lycra! (TM)