Cut your fabric. The dimensions of your hammock will depend on who is likely to use it. Cut your fabric to a width between 3 and 4 feet and a length 2 or more feet longer than the height of the tallest likely occupant. In general, fabric 42 inches wide and 8 feet long will work for a good, all-purpose hammock.
Sew the sides. Fold the fabric to create a 1/2-inch flap on one side along the entire length. Then fold the flap over itself to create a 1/2-inch double fold covering the cut edge of the fabric. Sew the folded material to create a tight seam. Repeat this step for the other side.
Sew the ends. Fold the fabric to create a 1/2-inch flap along the entire width. Then fold the fabric over an additional 2 to 3 inches. Sew the folded material to create a 2- to 3-inch opening running the full width of the fabric. Repeat this step for the other end.
Cut the rope. Divide the rope into two equal lengths, and cut it at the midpoint. Thread a piece of the rope through one of the 2- to 3-inch openings you created in step 3. Thread the other piece of rope through the other opening.
Hang the hammock. Choose a site with two strong supports, such as poles or trees, 10 or more feet apart. Use an appropriate knot to fasten the ropes securely to the supports. Leave enough slack to make it easy to get into and out of your hammock, but hang it high enough to allow it to sway comfortably above the ground when occupied.