Attached Link: http://www.uvmapper.com

However you only need to do any mapping if it is a new clothing item - if it is a pre-made item it will (or should be) mapped already and all you need is a template to show you where to paint. At best the maker will have provided a nice labelled template, at worst you will need to open the OBJ in uvmapper and save a new template straight away (without doing anything to the mapping, so with no need to save the object back out).