This“scarecrow” fabric question caught my attention. Without close-hand inspection it is always difficult to identify fabrics, fibers, and even colors. My approach to answering this type of question is to try to think through the original design process –the one the story's character might use – or at least the prop artist's attempt to recreate the process. So who makes scarecrows? Farmers. What materials, in this case fabric, do farmers have access? Fabric has always been and still is expensive; farmers are going to make use of (repurpose) what they have on hand. Farmers have access to “sacking” material. Open weave fabric like burlap is great for the transportation of bulky and dirty items like root vegetables – it holds the vegetables but lets the dirt drop off and out through the open weave. Conversely purchased goods like seed corn and chicken feed need a tighter weave so you do not lose the product you paid for. Even tighter weave is needed for something like ground wheat flour or gunpowder. The finer the fabric the more valuable it is. Flour sacks were often reused as pillow cases. Burlap would be used to make a scarecrow which would be stuffed with straw and hung on a post in the field. Feed sacks were the workhorse fabric to make dresses, shirts, or just hold stuff you did not want to lose in the barn. Feed sacks were often colorful, good calico (cotton) or homespun fabric which he farmer's wives treasured. Feed companies used that as a great marketing gimmick to sell their feed –even into the 1960s and beyond.
Although a real scarecrow would be burlap, no one wants a scratchy burlap mask on their face. Burlap is made of jute or hemp. Another rustic fabric made from another plant fiber, flax, is linen. Today linen is often thought of as a luxury fabric, but not historically. However linen has a “shiny” finish which does not match the appearance here. The most likely choice would be “homespun”. This is a woven, spun fiber, fabric. Yarns with a medium diameter can be woven fast because it takes fewer threads per inch of warp and fewer passes of the weft shuttle to make the cloth. The fiber could be spun from cotton, wool, or other animal hair/fur or a combination of fibers. Fortunately modern versions of “homespun” fabric can be found online and in fabric and craft stores.