Toques, mittens and scarves are all associated with northern climates, but the quintessential garment of Canadian knitting is surely the bulky and distinctly patterned West Coast cardigan. In the early twentieth century, Indigenous woolworkers on southern Vancouver Island began knitting what are now called Cowichan sweaters, named for the largest of the Coast Salish tribes in the region. Drawing on their talents as blanket weavers and basket makers,...