Layered clothing issue

So I tried making roblox layered clothings and I ran into some problems. There’s only one video on youtube about how to create layered clothings and I didn’t help much. Can someone explain why my top is doing this?
image

Also when I export from FBX and import it’s always 20x bigger.

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Does anyone know? Here is the file. If not can you link me to a advance video on how to make layered clothings?
Tried to rig:
test2.fbx (351.0 KB)

Without Rigged:
Layered_top1.blend (1.3 MB)