As the above image shows, whenever I move the armature that controls the upper arm, the corresponding part of the t-shirt moves slower than it. This is regardless of whether or not they have the same weights.
The picture shows them at different weights, but I tested to see if the same issue arises when all weights are the same. The whole object is composed of one mesh the t-shirt and the arm are all in the same mesh. How would I prevent the arm from moving through the t-shirt?
(I know I can delete the vertices that are blocked by the t-shirt, but this same error persists even then for the remaining vertices that are slightly inside).
I am using blender v2.72b.