As long as you don't use a copyrighted name you can not stop someone from making clothing that fits to a certain dimension. If tailor uses copyright code belonging to DAZ then DAZ may have a case. However this seems unlikely. It will cost DAZ a fortune to prove that the do have a copyright to the sizes of their models, and the may be unsuccessful eventually. DAZ has to find the person involved and that may be impossible from a net name. DAZ has to be sure its not suing a 13 year old boy or someone with no assets. So does DAZ have the money, the time , the ability to find the owner of tailor? If it does will it want to spend the money on a dubious case? This barking dog has no teeth, it does not matter what DAZ's position is if its not leagaly enforcable matter