3D mesh not importing to S4S

Here's the .blend:

I'm not quite sure what I'm doing wrong and I feel like I've done the UV mapping and rigging correctly for the most parts, so I don't really know why it's not working. I didn't add a .package file because I've tried it with multiple files for different tops but it's just not working out, I didn't change any of the settings in S4S (tried with just a basic cropped top and also the nude top). This is the second mesh I've done ever, and the first one worked just fine. The 1st one was a skirt and this one is a top, so should I have done something differently because of that?

Anyways, thanks in advance to everyone!