Why is it taking the coyotes so long to finish the sweater?
I've been grinding dates for the past half-hour at least, waiting on them to finish, and I still can't come over to their side of the Plains. There seems to be an invisible wall.
I tried restarting the game but it didn't work and I had to walk back to Oliver through the entire field because he wasn't there when I joined back.
Is the sweater not implemented and I should just stop playing here?
I think that's a soft lock. If you left the plains via Oliver after giving the coyotes the wool, you get that invisible wall. I think you're supposed to talk to Penny at the Red perch after you give the wool.
You can use the chapter select, pick the "Warm and cozy" quest, and ring the perch to call Penny, and that continues the story from there.