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Pin a wig-making wig cap to a wig head, then draw your part. Turn the cap inside out, pin it back to the wig head, and sew your first weft. Flip the cap over and continue sewing the weft. Cut the weft, and start your next row. Continue sewing row upon row of wefts.
Choose a wig-making or weaving wig cap and pin it to a Styrofoam wig head. Use the measurements that you took earlier to draw a U-shaped part on the wig cap. A white dressmaker's chalk will work well here, but you can also use colored eyeliner as well. If you are doing a side part, make sure that you do it on the correct side of the wig cap. Place the wig head onto a stable stand. You can use a special stand made specifically for wig heads. The first weft needs to go from ear-to-ear, along the bottom edge of the cap. Bring the thread down across the weft. Push the needle through the wig cap and out again, this time above the weft. Continue sewing until you reach the other side. Do not cut the weft. Anchor the weft to the wig cap with a double knot. The weft must match the distance between your ears along your back hairline. Refer to your measurement! Use a thread color that matches the wig cap. Take the wig cap off of the wig head first. Flip the cap right-side-out, then pin it back to the wig head. Continue sewing the weft to the wig cap, just above the hem. The new row needs to start to inch (0.64 to 1.27 centimeters) above the first one. Keep sewing until you reach the other side of the wig cap. At this point, you can cut the weft, or fold it back on itself and continue sewing the next row. Work your way from one side of the wig cap to the other, bottom to top. When you are about to inch (0.64 to 1.27 centimeters) away from the drawn part, stop. Sew the final rows as close together as possible. This will make it easier to style the wig as well as blend it with your own hair.