I've found this blog. I want to say THIS IS NOT MY MATERIAL AND JOB so my compliment to the author of the blog.
I want to post her tutorial in case in the future I won't find it.
This is the original tutorial page.
Part 1: how to sew girls hair : pigtails
I want to show you how I make doll’s hair out of knitting yarn.
First you need to draw a line on your doll’s head, starting from her forehead all the way over her head to her neckline where you want the hair to end. Measure that line (e.g. 15 cm). Then take some Scotch tape (= the same length as the line you’ve just measured) and put it with the adhesive strip up on your table.
Now measure how long you want the hair to be, e.g. from her left shoulder straight up over her head to her right shoulder (26 cm in this example).
Now place the yarn one thread at a time on the tape (don’t cut them!), as shown in the picture. Make sure they lie neatly next to one another.
Place a piece of paper tissue (I’ve used toilet paper) on top of the centre line.
Carefully turn everything around and start sewing over the tape with the paper tissue at the bottom. (Use little stitches!)
Carefully turn everything around and start sewing over the tape with the paper tissue at the bottom. (Use little stitches!)
Remove the tape and the tissue. Do this very slowly and with extreme care to avoid moving any hair. You might want to use tweezers for this.
Place this ‘wig’ on the line you’ve drawn earlier on your doll’s head. Make sure you keep the right and left side separated so the stitched line is still visible. Now pin and sew it manually in place, starting from the forehead and ending at the neckline.
Once you’re done with this, you can use some fabric glue to keep the hair in place if desired.
Now draw a line on both sides of the doll’s head, as shown in the picture.
Take the first 4 threads and sew them on this line. Then take the next 4 threads and do exactly the same.
Repeat this until all threads are sewn in place.
There she is: one side is already sewn in place.
Once you’ve done both sides you can make pigtails and sew on a nice ribbon to render the stitches invisible!
You can make all kinds of hair using this method. You could make bangs (in this case you have to sew very short threads of yarn on the Scotch tape and sew it on top of the doll’s head before you sew the long hair!). Or you could use ‘ribbon-yarn’ or strips of fabric. I guess I must try that one out on my next doll.
part II: how to sew boys hair
For the boys I use the same method, but I sew the wigs in another direction on the head. Because you need more wigs, to cover the head completely, I use a quicker method to sew the wigs. This is how it goes:
1. Measure the dolls head from ear to ear (over the back of the head). This is the length of tape you need. I use no longer the Scotch tape, but I use masking tape, which is less strong, and easily to remove from the yarn. Also important: you can sew right onto this tape and there is no need for tissue paper any more.
2. the length of the yarn = 2x the length of the desired hair. For a boy I usually take 5cm, so you need to cut threads of 10cm. As you see on the picture, I use a little book for quick and easy cutting the yarn. Now place the yarn one thread at a time on the tape. Make sure they lie neatly next to one another.
3. Start sewing over the yarn with the tape at the bottom. Use little stitches, and press the yarn down with your fingers so it won’t get stuck under your presserfoot.
4. Remove the tape. Do this very slowly and with extreme care to avoid moving any hair. You might want to use tweezers for this.
5. Place this ‘wig’ horizontally on the backside of your doll’s head. Now pin and sew it manually over the stitched line of your wig. When you’ve done this, you fold the hair down and the first row of hair is done.
6. You make as many of these wigs as you need and sew them at 1cm above eachother on the dolls head. Make sure you sew the last one a little over the seam of the head (which means: on the forehead). Notice: the shorter the hair, the more wigs you need. This is how it looks before the haircut:
7. And this is after the haircut:
8. You can use this method also for a girl with loose hair. For example, the last ‘wig’ of this girl is sewn not at the center of the threads, but a few cm on the right side:
