Hi everyone,
Recently i’ve noticed that the cloth on my avatar has hole like in this picture.
Unity seems to be fine but the moment i upload it into VRC, this happens.
Unfortunately i did not take the screenshot before this happens 
This looks like a weight painting issue in the cloth. When the shoulders or arm are lowered from a T-pose to the natural resting position, the cloth moves (“clips”) inside the body mesh.
You could try to fix the cloth weight painting issue in 3D modeling software such as Blender (using automatic weights, Robust Weight Transfer add-on, or manually painting weights to the related shoulder/arm bone), or by removing any unneeded body mesh under clothes if applicable.
I can try using Blender and see how it goes.
I would add that as the mesh seems fine in T pose in unity, it is possible that the amount of polygons on the joints is too low, making deformation when the avatar moves with the IK create holes. If so (still within blender), you would need to increase the amount of polygons around those joins.
I’ve tried your solution and unfortunately it doesn’t work.
I’ll try another solution and see if filling it with polygon helps…
I’ve also tried your solution and it also doesn’t work
I’ve found a fix to this issue.
It seems that my outfit doesn’t have the correct Skin Mask texture as the texture is filled with white entirely instead of black on the specific parts therefore causing holes in the Shirt when i pose.
Thank you so much for the solutions but unfortunately it doesn’t work for my case and i’ve found out the solution myself.
Idk when or why did the texture is fully white but i’ve managed to fix it.
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