Some times these are called postcard quilts as you could use a regulation postcard for a template. Thousands of rectangle utilitarian bedcovers were made. It's hard for us to see these as fashionable, but they must have been in 1912.
What had started out as a fad in elegant silks about 1883 was by 1912 typically done in wool and wool and cotton blends. Political problems with Chinese imports had made silk relatively expensive and the expansion of ready-made clothing factories made wool and blends an accessible option (particularly cheap if pulled from sample books or obtained as factory cutaways.)