Can anyone recommend a source that will supply the prices of infant clothing in 1970?
Sears, Roebuck & Co. publishes a catalog of merchandise. Some libraries have them going back to the beginning of the 20th century. In the catalog you will see illustrations of products, descriptions, and prices. Likewise, archival microfilm of newspapers and periodicals may also contain classifieds and advertisements for different products. Also, the Archived New York Times is an excellent resource. The index goes back to 1800s, all the way to 2003.