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Hold the tape measure on the natural hairline and run it back to where you want your lace front piece to stop. The length of your lace front piece is up to you.  Next, measure from side to side. Hold the tape measure just in front of one ear, where the hairline ends. Wrap the tape measure over the head, to the same spot in front of the opposite ear.  To get the most accurate measurement of the head, you'll need to flatten the hair. You can wet the hair to flatten it, or put your hair in a flat style, such as corn rows. Take a piece of plastic wrap large enough to fit over the head. Wrap it tightly over the top part of the head. Keep it as tight as possible, and fasten it at the back. Apply clear adhesive tape to the plastic wrap to begin forming the pattern.  Start by taping from side to side. Secure a piece of tape over one ear, and run the tape over the top of the head to the other ear. Make sure the plastic wrap is secure, but not too tight. Tape from front to back. Cover the entire head with tape until the pattern feels rigid. Trace the hairline using a soft pencil. Start in the front and go just over the ears. Tape over the pencil to keep it from erasing or smudging. Carefully remove the pattern from the head and prepare to pin it to your wig block. Take some stuffing and place it in the pattern. Place the pattern on a wig block and secure it using balled straight pins. Once the pattern is secure on the block, go back through and add straight pins along the hairline. . Use the pattern to measure a piece of lace. You'll need some extra lace to work with, so don't cut the piece to the exact size of the pattern.  You may need to dye the lace to get it to match your skin tone. If you need to dye the lace, do it now, before you secure it to your pattern. You can find wig lace online or you can by similar fabrics at a craft store. Drape the lace over the pattern on the wig block. Secure the lace along the hairline using balled straight pins. Once you have the lace secured to the wig block, trace the entire hairline using small straight pins.  Take care not to let the lace get ruffled as you work. Keep it smooth and tight. Once the front hairline is completely pinned, smooth the lace down to the back of the pattern. Secure the back with a straight pin and continue the pinning process in the back. Continue to keep the lace tight as you work.  You may end up having to fold some of the lace in the back to keep it flat on the pattern. Pin the tip of the fold to secure it, and then sew the open end of the fold shut. Remove all the pins from the lace and take the cap off the pattern. Test the fit of the cap and make any necessary adjustments.

Summary:
Measure the head. Make a pattern. Secure your pattern on a wig block. Cut the lace Secure the lace on a wig block. Test the fit of the cap.