Lost Coast Historical Patterns in Fort Bragg, California offers a variety of garb-making supplies. For steampunk fans, there are a variety of traditional Victorian patterns, based on original clothing from the eighteen hundreds. There are also quite a variety of patterns for things to make your skirts bigger and Lost Coast Historical Patterns does sell the all-important hoop wire. FYI, the Victorian era was from 1837 to 1901, but you should always feel free to throw in anachronistic details or accessories which never were when costuming for steampunk.