Nicodemus' site on Materials and tools, in some more detail - http://www.nicodemus.org/fursuit/mat.php
Interestingly enough, the alt.gothic.fashion.faq is of interest - http://www.ice-princess.net/gothfash/faq.html
Antimony & Lace, a DoItYourself style goth site - http://gothfashion.info/