Cornell University's School of Industrial and Labor Relations hosts a fantastic web exhibit on the Triangle Shirtwaist Fire in 1911, complete with pictures, primary sources, and background information on urban sweatshops during the late nineteenth and early twentieth centuries.
Objects discovered during archaeological excavations at Mt. Vernon provide us with some idea of the tools used in colonial clothing manufacture and in the ways in which slave clothing differed from George Washington's garb.
The Wisconsin Historical Museum offers a fantastic array of images of children's clothing through the decades of American history.
The Costume Institute at the Metropolitan Museum of Art is one of the world's most renowned historical fashion collections.
The Middle Tennessee State University Library offers a number of sites pertaining to clothing and fashion in American women's history.
The Chicago History Museum contains a comprehensive costume and textile collection, specializing in the period extending from the late nineteenth century to the present.