I'm not a member of SCA, but I have seen web pages and newsgroups devoted to it..if you get newsgroups, bring up your list and search on SCA...on the WWW, a search on 'Society for Creative' gave me 5000 hits..like this...

http://www.itasca.net/~sgh/sca.html

as to Waulking...they spin the yarn and weave the cloth...then it is soaked..(traditionally in cow urine, I believe) and beaten on a table or bench, passing it around or back & forth so it gets 'moved' to different positions and is thus shrunk evenly....see this picture (there are a lot of 'hits' on waulking, but I didn't look further than this..)