ok, I just checked and you are already cleared to read and post on the forums Captain
(I went over to do it, but it was already done)
The first area to look at is labeled costume resources, right now it just includes the 2 links I already posted here, but as more and more people try to work on home made costumes, I expect that to grow.
Also in that section is a repost of Monolith21's costume break down. basically who offers what and ups and downs of each place.
In the costume section there should be a more detailed discussion of costume fabrics, but I'd need to check to be sure.