The Yahoo groups listed below are for buying/selling garb and other medieval/renaissance related wares. Not all groups are Adria sponsored.

http://groups.yahoo.com/group/renaissance_merchant_forum/
http://groups.yahoo.com/group/renfairemerchants/
http://groups.yahoo.com/group/SCA_Maids_and_Valets/
http://groups.yahoo.com/group/TheScanadianScrolls/
http://groups.yahoo.com/group/garb4sale/

http://www.allthingsbellydance.com
Julianna and Mathe's website

http://www.medievaltradingpost.com
Gabriele and Ruadrhi's website