Buy a wire wreathe outline in the desired size
Buy and cut your desired colors of fabric into 6-8" strips that are 1/2" wide
Take a piece of your fabric and put it through the wreathe outline so that there is half of the strip on both sides
Tie the strip in a knot
Tighten the knot
Continue doing steps 3-5 for each color of fabric
Repeat steps 3-6 until the wire is covered
When you are finished, you may add leaves or pinecones, or anything festive that is related to fall, to your wreathe so that it is more creative.