You shouldn't need the UVs as that's if you wish to import it into another mesh and other 'stuff' I don't know much about either. To import your new hatband into Poser just click FILE->IMPORT and choose the 'Obj' selection. Be Sure to UNCHECK the option that says "Percent Size" or it will import as a GIANT hat band!. It will not 'overwrite' anything in your Poser scene but just import a new Prop item. Then just move it over your existing hat and align it (I find it easiest to texture it a bright RED for easy visual at this point). You can use the original template for painting your new hat band or from UVMapper save out just the 'band' if you wanted to make the texture separate. Don't forget to Enlarge your hatband or it will dissapear 'into' the hat as it is now an exact duplicate of that 'section' of the hat!!