As far as the UV map, it looks like on Roxie'stanktop, the poser file didn't recognize the new obj. Or that you have 2 shirts occupying the same space. I find the best way to UV map clothing is to use a mapper that will allow you to create seams and then unwrap based on those. I've never used UV mapper so I don't know if that can do that. Then look at real-life shirts and make the UV seam based on where the seams are in the real shirts. And most of the software I've used to make maps did best if you have the seems in the middle of where you want to cut, so if your shirt is 20 faces around, have 10 in the front and ten in the back for the side seams. and do the same for seams at the shoulders. Usually, you can tell, but sometimes, I've counted out the faces.

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