I made a hooded cape from brown fabric using a commercial pattern for a child's costume cape.
The quiver is a cardboard tube covered with fabric and trim. I cut slits in the tube and ran a thrift store leather belt through the slit . The belt can then be adjusted for wearing over the shoulder. There is another belt at the waist and a simple pouch made from a circle of fabric gathered at the edges and tied to the belt.
The arrows are dowels with feathers glued on.
This is a simple and inexpensive costume to make.