Unfortunately, some process books can be - how do I say this - boring.
Not Feeding the Sheep (and not either of the other two books I linked to).
Feeding the Sheep starts with the woolly creatures eating corn and hay on a winter day and ends in autumn, with a sweater as warm as a hug. Structured as simple Q-and-A dialog between a little girl and her mom, we see the sheep being sheared, the wool washed and dried, spun into yarn, dyed, and knit into a sweater.
Andrea U'ren's watercolor art manages to be both scenic and energetic, and extends the information given in the text. I am not familiar with this illustrator (OHHH! She did Mary Smith, that odd, great-looking book about the woman with the peashooter), but she paints animals and people with as much verve as Stephen Kellogg, interiors with a draftsman's precision, and landscapes with the assurance of someone who has spent a lot of time outside with an easel. The mom and little girl, in her hands, are people that I'd like to know.
A fantastic gift for the knitter in your life, and a great addition to the elementary classroom.