Select fabric for the garden flag.
Cut out cardboard or paper templates for your applique or patchwork design.
Cut out two 15-by-21-inch rectangles of fabric for an applique flag.
Adhere applique pieces to the fabric with a spray adhesive.
Stitch together the nylon pieces of your garden flag using a wide and short zigzag. Use a 1/4-inch seam allowance for fabrics other than nylon. Repeat for the second garden-flag panel.
Place the two panels with the right sides together. Mark the panels 1 1/2 inches from one short side. Sew from one mark around three sides, stopping at the second mark.
Turn the remaining 1 1/2 inches under half an inch and stitch to form a hem on each side. Sew partway up the short side with a 1/4-inch seam allowance, leaving an opening for turning.
Turn the garden flag right-side out. Topstitch the opening on the short side closed.
Sew a seam 1 1/4 inches from the hemmed edge of the flag to form a casing for the flagpole.