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Order a solid black sweat suit in a size that will fit the costume wearer. Purchase a yard of matching black fabric at a craft store. Find printable patterns to make Toothless' wings. Draw one side of the pattern on tracing paper. Sew the wings together, leaving a few open seams so that you can stuff batting into the wings to give them shape. Sew the wings to the back of the black sweatsuit. Measure the distance from your waist to the ground. Add the forked end of the tail by sewing on pieces of extra fabric. Repeat the template, cutting and stuffing process with two horns on each side of the hood of the sweatsuit. Cut out green eyes from construction paper. Glue the eyes on either side of the hood with strong glue, like E6000. Choose black shoes to go with your sweat suit.
Choose one with a hood. You can find them on Pinterest. Print them off. Fold it over and cut across a folded piece of paper. Pin it to the fabric and cut through two layers of fabric, so that you have the front and back of the wings. Sew up the remaining seams by hand. Cut a several five inch wide black strips in that length. Sew them together and stuff them with batting to make the tail. Glue them on cardboard. Color slits into the center with black permanent marker. Allow them to dry before you wear the outfit.