American Memory (Library of Congress) - Searchable collection of online historical images.

Costume Page - Costume and costuming-related links.

Costumer's Manifesto - Very comprehensive collection of costume links.

Fashion Era - Hundreds of pages of fashion history, costume, clothing and social culture.

Fashion Plate Collection - Digitized fashion from American and European journals.

History of Costume - Web version of the book Costumes Through the Ages.

Picture Collection Online (New York Public Library) - Historical images of clothing, dress and accessories.

Timeline Fashion - Timeline of the past century in fashion.