Ok first let me start with saying the wefting technique I use is the same one listed here:http://www.craftster.org/forum/index.php?topic=195129.20
I use this method to make my strands even:http://www.craftster.org/forum/index.php?topic=205341.msg2495585#msg2495585
and I use freezer paper instead of tape:http://www.craftster.org/forum/index.php?topic=205341.msg2526353#msg2526353
Also please note this tutorial is on how I place my strands aka wefts on the dolls head. There are many other ways to do this this is just what I've found most convenient.
I'd be thrilled if others would share their tips and tricks too!
this is just my experience but I only use lighter weight yarn nothing higher than a #4 worsted weight. I prefer a #3 DK but I am finding it very difficult to find DK yarn in my area at all lately.
next I always have some wefts that look funny:
Click to see full sized
you can see the bare spot in the middle of this one. There's also an area where my stitches nearly ran off the edge of the weft. But it's ok. When you layer the wefts on the head properly it will be fine.
Now everyone put thier wefts on differently. So this is just one method I use.
First when stuffing your poppets body and head make sure to stuff VERY firmly. Also it helps a lot to put a popsicle stick in the back and all the way up the neck. This gives the doll a "spine" and helps her neck support her head when the hair is on it. (just like a person) I have heard if you stuff firmly enough you don't need a spine but I am terrified of bursting a seam.
Next for the demostration of how to place wefts mr bald clone trooper will be assisting:
Please also note for this demonstration I am using weft scraps left over from previous projects. One is a bulky or #5 yarn and I'm only using it for demonstrative purposes.
Ok now I place the first weft starting at the base of one ear right on the side seam.
Then I wrap around the head following the red arrow. If you keep the first weft that low it helps to prevent bald places when you do pig tails.
I pin at the middle seam and then around to just below the ear on the opposite side.
Here's how it looks in place:
Now I typically make very long wefts I plan to change this in the future but it works for now. So I pin at the bottom of the other ear then fold the weft and layer over top of the previous row:
It is very important to put the last seam of the new weft right up against the top seam from the previous one:
Here you want you to focus on the section in the gray circle. You can see in the red rows the first line is the bottom seam on the new weft, and the next line is the top of the first one. they are right up against each other.
This is also to help prevent scalp from showing when you do pigtails or updo's.
I made an example flat with 2 different colors in case you can't see what I mean:
That's from the top this is what you will see from your view if you layer right. No spacing between the wefts.
This is from the underside. You can sort of see through my fuzziness that the strips are right on top of each other.
Then this is the way I position the rest of my wefts:
the red lines indicate how I stack the wefts on top of each other. I also place one weft in front of the ears usually also starting and stopping at the base of the ears. Then I trim it to give bangs/fringe or part it or whatever.
Once you have all the hair on your poppet it will be uneven. I find it much easier to trim the hair every other layer added to make it even. If you are doing a shorter style then I wait till I have all the hair on the doll and trim it close to the length I want and then even it out.
I hope this is helpful to others!