This cowl pattern was a “Mystery Twit-A-Long” which happened May 9 to 25, 2018 on Twitter. You can still play along after-the-fact by following the pattern link from this page, and getting started - it leads to the tweet which is the beginning of the thread.

(The idea of the “Mystery Twit-A-Long” was that you wouldn’t know what you’re making, and the pattern instructions were given out bit-by-bit on Twitter. Participants followed along with their knitting, and watched what took shape!)

(Like this kind of thing? There’s one other - now completed - MTAL that I’m aware of, check out http://www.leethal.net/patterns/twittermystery.html)