This pattern is from the book New England Knits which is available as an eBook.

A long scarf knitted side to side with buttons and buttonholes along the edges offers a variety of options for wear. Wear it unbuttoned like a traditional scarf or fasten the buttons and wrap it a few times around your head and neck as a cowl. A sophisticated lace pattern and cashmere yarn make this irresistible any way you wear it.