Thank you!
I have to say that i'm a new designer. I've tried to use the Ebody Curvy dev kit and the SL avatar as well, that i donwloaded on SL wiki. The result was the same. I'm using Blender 2.79 and did i saw a lot of Youtube tutorials. Do you have some suggestion about a rigging tutorial that can help me with this problem?
Again, thank you for answer.
EDIT: You helped me a lot! I was rigging in a wrong way.
Thank you!