Refletion Maps Are Not Working Properly

All RIght, I have a character on Unity, he has an metal armor, ANd I've added a cube map on him following the model's UV Map OK. But the problem is that I only want reflection on the armor, not on the entire model. I've tried with white in the areas of the map I don't want reflection, tried with full transparency on the same areas, complete black either, but anyway i'ts always refleting everything, even the cloth!

Can someone please help me?? How do I fix it?

Thanks for all the helpers! Arthur