Measure the circumference of your shoulders. Measure the length from your shoulders down to the top of your foot. For example, the circumference and length together might be 32 by 60 inches, respectively.
Trace a a piece of silk fabric to match your dimensions, for example 32 by 60 inches, with standard chalk. Cut the outline of the cape along the trace lines with fabric scissors. Trim away any excess free-hanging fibers with pinking shears.
Place the cape onto a ironing board. Fold one of the edges 1/2 inch over the body of the cape. Iron the fold to crease the edge. Continue this process three additional times until all edges are ironed.
Stitch the folded edges into the cape using a straight stitch pattern and a sewing machine. Stitch a 1 1/2-inch wood button into the top left, outside corner of the cape. Slice a 1 1/2-inch-wide hole in the top right corner of the cape.
Trace and cut two 18-by-18-inch silk velvet pieces into the shape of isosceles triangles. Trim away any free hanging fibers with pinking shears.
Place the triangles one atop the other. Adjust the triangles so all edges are flush. Stitch the 18 inch edges together. The triangles now form a hood.
Lay the cape open -- so the outer side is facing up -- on a work surface. Center the open hood atop the cape. Adjust the hood so the unstitched edges are flush with the top edge -- the neckline -- of the cape. Stitch the underside long edge of the hood into the neck line of the cape.