Well, there's a bit of a trick to it. You don't join the ICG, you join one of its chapters--and by extension you become a proud member of the International Costumers Guild!
If you go out to our list of chapters, you'll be able to determine whether an active chapter exists near you. But if one doesn't, fear not, because you can still join one as a remote member (just about every chapter has members from all over the world), or even sign up with the Silicon Web Guild, which is entirely online! Most (if not all) of the individual chapters have information on how to join up, as well as information about events, activities, etc., and their web site addresses are easily accessible from the list.
And if you have at least five other people in your area who are also interested in costuming, why not start your own chapter? The details and requirements for doing so are located on this page.
We've also got a mailing list called ICG-D. You don't have to be a guild member to join; the list is for general costuming-related discussions and occasional bouts of silliness. If you'd like to sign up, visit our publications page.
So feel free to browse our web site, email us if you have any questions, and we hope to see you soon!