A Bit About Knitting

Or, actually, the raw materials for knitting...

woolgathering\WOOL-gath-uh-ring\ (noun): indulgence in idle daydreaming

In Wales, woolgathering, or gwlana, was a social custom adopted to provide for poorer wives of laborers who did not have access to wool of their own to spin. It involved walking along hedgerows and stone walls and picking off wool that was left behind as the sheep had passed by. Later, after the custom was in little use, woolgathering was considered an unprofitable enterprise. Its practitioners were perceived to wander aimlessly and gained little for their efforts. Hence the association of woolgathering with your mind wandering aimlessly.

Merriam-Webster Dictionary