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If there's no actual "edge" to the jeans in 3d the way to move the waist down is not done with meshing - it's done by editing the alpha and textures for it. You can't just pull down the vertices - there's no body underneath, just what your mesh is. If there IS an edge to the jeans you might be able to gently smooth that out by manipulating the vertices, then use the align normals plugin to fix any darkening on that edge.
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Panquecas, panquecas e mais panquecas.