Quote - sounds like the UV templates aren't completely flat (in other words when the dress obj. was unwrapped and flattened during the UV process, the UVs weren't relaxed... so there's distortions.)

Does this happen with every template you use or just this particular dress?

Actually I'm not sure, as I've only been trying with this dress. I'll have to try some others and see what happens, and then I'll get back to you!