A few resources for researching fashion and the fashion industry:
Berg Fashion Library, includes the Encyclopedia of World Dress and Fashion (Oxford, 2010) and many other books about fashion.
Encyclopedia of Clothing and Fashion (Scribner's 2005).
Vogue Archive-issues from 1892 to the present
WWD (Women's Wear Daily) – current paper issues are in the Business Library, full-text (no images) is available from numerous sources, the microfilm backfile is in Business
Databases: The Ebscohost Research Databases, provide an excellent multidisciplinary search.
Check CLIO for books. Most books about designers are in Avery Library; general works about clothing and dress will be in Butler, Barnard, or Business. Try WorldCat to search beyond Columbia's collections. If material is not available at Columbia, try Borrow Direct or ILL. If you need to use the FIT library, come to the Butler Reference Desk.
If you have any questions about researching fashion, please Ask a Librarian.