Your screenshot shows you have a syflexICollideMesh node in your ICE Tree.
In general, don't use those lower-level nodes unless you have a good reason for it.
Prefer the nodes like Syflex Collide Mesh.
Hmmm... I think there is some confusion here.
Here is the screen shot from sample scene of a Syflex Tshirt that comes with SI. This scene works.
Isn't this exactly the same node as in the manual screen grab and my test scene?
Tshirt.jpg [ 138.22 KiB | Viewed 811 times ]
My scene works also. Until I connect the Pin node.
That is the issue not the Collide Mesh.
I don't know of any other collide node to use and Collisions are not the problem.
If there is some node network you have with Pin working could you please share it as a grab? Or even the file so I can have a look?