[Texture with alpha channel]

Thanks for your help everyone! Giving it a rest for now, SL is much harder than I expected. 

[Skin didn't export?]

Oh it's the sweater. I made it on whatever body SL provided. 

[Skin didn't export?]

Hi everyone! I'm new to SL. I've been creating on IMVU for 13 years so I'm not new to meshing. I've exported my first mesh from Maya, I've attached the image. 

I was hoping someone could tell me what I've done wrong exactly, I'm at a loss. I'm used to exporting the skin of the entire torso, however I seem to have managed to export the skin under my mesh, but the skin at the waist is missing. How does this work? 

Any tips well be so welcome!