Sketch the design of the formal clothing you want to make, such as trousers and shirts for men or dresses, blouses and skirts for women.
Take your measurements specific to your choice of formal wear. For example, measure waist, hips and length for a skirt. Measure shoulder width, torso length, arm length and width for shirts or blouses.
Drape and pin the fabric to the duct tape dummy; use your sketch for reference. Mark a stitching line at points where the fabric joins, including the hem, waistband and the sides. Alternatively, use a pattern purchased at a fabric store or from a tailor.
Place the pattern over the fabric and cut out the material. Stitch along the outline of fabric giving an allowance of 1/2 inch from the edge of the fabric.
For a makeshift pattern, place a ready-made shirt or skirt on the fabric and cut around its outline. Give an allowance around the outline to ensure there is enough fabric for seams.
Mark stitching lines as indicated on the pattern by drawing on the fabric, 1/2 inch away from the edge. Stitch along these lines with a sewing machine.
Cut off any hanging threads or excess material after stitching the pieces together.