(SOLVED) Sims hands clipping through sleeve area of mesh

EDIT: I slightly reduced the clipping but still can't entirely so here's the updated blender file and a shot of the clipping - link

---

So I've almost finished this mesh but I'm having difficulties with the hand part of the mesh. It's for a request and the example shows the sleeves partially covering the hand in a snug manner. But when I load in after modelling it seems the mesh stays still whilst the hands move freely.

Here's the mesh (asymmetrical crop top) being still 



I can't get a preview of the Sim in motion but basically no matter how much I scale, if the hand moves it clips through the sleeve. 

I don't know if any of that really made sense so if clarification is needed please lmk 

Here's the package/blender file if someone is willing to take a look - files )

Thank you!!