I think the problem is that the vertexes of the central part of the skirt
rigidly attached to the central bone.
It is necessary to distribute the weight of the vertexes between the central bone and leg bones.
Search tutorial by phrase “Blender Weight Paint”
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Example:
[video]http://www.youtube.com/watch?v=m40S0W5ugJo#t=546[/video]
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