LOL Nice. I'm trying to build something similar to the more organic batman suits really. I know theres a way to coat a shirt in latex that will last but I don't know much about where to get the proper kind.
some of them sell liquid latex, its used to paint latex "suits" on peoples skin, but i dont see why it wouldnt work, you could probably buy a small bottle and see how it works on you clothes,
i used to know a woman who worked at a "couples" sexshop, so used to pick her up from work and this is how i know .....seriously
personally i wouldnt go the mask type latex rubber route with the info of your project,
If you need alot, you may want to look at expired latex. $15.00 for a gallon, and probably another 15.00 for shipping. I have never ordered from them, but it was recommended on halloweenforum.com.