Duroch Armory - http://www.duroch.com - Daemarth's Armory. Maker of fine foam weapons guaranteed to pass for Riverbend. Also sells materials!
The Ringlord - The ringlord is THE source for following maille armor supplies. EVERYTHING you need, and much much more.
The Ringlord - http://www.theringlord.com - The ringlord also has a wide assortment of tutorials on making chain armor. Free to download!
Riverbend Tunic Construction page - http://www.riverbendcombat.com/tunic.html - simple tunic instructions with picture.
Jikanta's Northlands construction page - http://www.kingdomofnorthlands.com/howto.php - kinda old, but a good place to start. These guides are for straight Belegarth rules, so some modifications may be necessary.
Amtgard - http://www.amtgard.com - Really different game, magic, classes, levels, etc.
Belegarth Medieval Combat Society - http://www.belegarth.com - Riverbend is proud to be a realm of Belegarth
— Arnor, Realm of Belegarth - http://home.earthlink.net/~mikhoc - St.Louis's Belegarth chapter
Dagorhir Battle Games - http://www.dagorhir.com - very similar game.
— Clan Issola, Chapter of Dagorhir - http://www.angelfire.com/realm3/clanissola/ - Southern Illinois University at Edwardsville's Dagorhir Chapter