Welcome to Gaia! ::

I decided to compile a list of links that might be helpful to cosplayers.

I'll be adding more as I come across more sites. :D

COSPLAY GALLERIES, FORUMS
Cosplay.com
Cosplay Lab
American Cosplay Paradise
Comic Fiesta

GUIDES FOR NEWBIES, ABOUT COSPLAY/CONS
Limit Break's Beginner Cosplay FAQs

WIGS, DYES, STYLING
How to Wear a Wig
CosWorx Probably the best site to buy wigs. Make-up, shoes, make-up and other accessories can be bought here.
Amphigory Another site to purchase wigs from as well as make-up.
Katie Bair's Petting Zoo Wigs Buy wigs, wig supplies, find wig commissioners and wig styling tutorials here.
Sakura Wigs Another site to buy wigs from.
Punky Hair Color Dye Where you can buy good quality temporary hair dye.
Kukkii-san's Weft Tutorial
The FW Homemade Wig Dye Recipe
Limit Break's Wig Styling Tips

CONTACTS
CoastalContacts
Vision Direct
Cosplay Lab's Contacts

PATTERNS
Simplicity
Butterick
Burda
Folkwear

SHOES, BOOT COVER TUTORIALS
Limit Break Cosplay's Boot Cover Tutorial
Sarcasm-hime's Boot Cover Tutorial

COSTUME CONSTRUCTION TUTORIALS
The Tutorial List (Cosplay.com)
How to Make Feathered Wings
How to Tie an Obi

PROPS, MATERIALS USED TO MAKE PROPS/ARMOR/ACCESSORIES, TUTORIALS
Fiberglass 101 Fiberglass 102
The Prop Blog
Armor and Propmaking for the Fiberglass-phobic
Working with Polymer Clay
Sarcasm-hime's Tips for Making Accessories
Amethyst Angel's Tutorials

SKIT, MASQUERADE, PERFORMANCE
Limit Break's Skit Tips

If I were you I'd take down Sakurawigs from the list. Sure, they make wigs but it's a ridiculous amount of time between ordering the wig and receiving it. (One account was 3 months since paying)