This is interesting...

http://www.newscientist.com/article/dn16126-nanotech-clothing-fabric-never-gets-wet.html

More information here:

http://www.sciam.com/article.cfm?id=self-cleaning-materials
http://www.sciam.com/article.cfm?id=everything-proof-materials

In summary, by manipulating the surface texture and composition of a fabric, you can prevent liquids from wetting it, therefore they can't stick to it.

This strikes me as having more than a few preparedness applications.