Heeey, here's some ideas I found
http://alemonsqueezyhome.blogspot.com/2010/11/gathered-belt-tutorial.html
http://creativelittledaisy.typepad.com/creative_little_daisy/2006/08/belt_tutorial.html
http://diyfashion.about.com/od/diyaccessories/ss/Make_A_Belt.htm
Hope that helps. Happy crafting!