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Cosplay.com
all around great resource. Free image galleries and forums, etc.
The Costume Page--

making and wearing costumes (of all kinds!)

 

MILIEUX Online Costume Sources/Supplies

huge selection of links including suppliers and stores online of boots, armor, books, hats, wigs, metalwork, findings, masks, prostetics, and gothics.

 

Cosplay/Anime Costuming and Masquerade Links

uniquepatterns.com - patterns based on your measurements
sewingpatterns.com